Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. Check again when the temperature rises 2) Low refrigerant charge (most common cause). On 2020-04-08 by (mod) After the system runs for a while, raise the RPMs up to about 1,500. It had this problem prior to replacing these parts. Also, was your fan on? JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. If youre tracking down a wiring issue, Eautorepair.net is the better choice. thanks. 4. If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. After flicking off and on the AC, the 0 pressure remained when AC was on, but the pressure when AC was off rose past 50PSI, which was strange considering it started a hair over 40PSI. Turn on car, turn on AC to max cold and add your refrigerant. What makes the coupler not to stay secure? CONF-960254--. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Perform a visual check to see if the compressor is running. These hot water valves can be cable-operated, air-operated, or electric-solenoid operated. "Static pressure" is measured when the system is not running. What could be the problem? If the system is continuing to cool it may be doing so at reduced capacity, observed as a loss of up to ten degrees of temperature drop across the coil. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped 5. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). 4) Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. Evac/pulled vacuum. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. I vacuumed the system and put new refrigerant. Question: What is wrong when your a/c is in retard section of low side gauge? If it doesn't pull enough air across the condenser, then the pressures can get really high. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. A clogged filter leads to extended oil and thus result in poor combustion. Thus, this problem requires immediate care. what causes high pressure on the suction line on Rheem R410a ? Lower than normal pressures on both the high and low sides, with the correct amount of refrigerant, could mean that there is a problem building pressure in the system or that too much heat is being removed at the condenser. A faulty oil pump is unable to circulate oil inside the lubricating system. Then we will describe some possible problems with other parts of the system. Fix: Remove excess refrigerant or evacuate and recharge with the correct amount. its hard to make a guess. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. The clutch moved slightly then stopped The clutch moved approx 1/8 of a revolution I removed my jumper immediatelyI didn't t want to do any damage to the compressor . "Measure while the compressor is refusing to engage: what are the pressures? Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. In this case, the reason is a damaged oil pressure gauge or sensing unit. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. PSI was around 60 off and 0 when on. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. Answer: By the temperature in and out. Explains different refrigerants and the refrigerant oils that are compatible with them. Oil pumps circulate oil throughout the engine. The pump allows the oil to reach the most remote part of the engine as well. Low HVACR compressor head pressure diagnosis: What are the causes of low head pressure at the air conditioner or heat pump compressor? Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. A clogged filter is due to leaks therefore needs replacement. Question: The A/C compressor has seized on my 2000 Sienna. 2006 dodge Durango slt 4.7l with front and rear ac. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. 1. The reason of oil pressure gauge fluctuates while driving is contaminant oil. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. High side drops from 55ish to 35ish (wow thats really low) 4. Engine coolant levels will be low. When the proper pressure is reached, the vents blow warm air and the compressor drops out. It is not turning on and off at all, just constantly running. Answer: If the compressor seized, the pulley should still turn. In other words, the evaporator core ices up and stop cooling. A series of doors controls the airflow through the heater box or plenum. In other words, the compressor is sucking, but theres nothing to suck. Update, tried to add some of that refrigerant AC-PRO stuff. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. I'm here for knowledge and to maybe give some. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. Adj. The AC Heater box or plenum is located under the dash. I evacuated the system to get ready to add 134a. Question: I have a 1998 suburban with rear a/c. A hot water valve closes the flow of hot coolant through the heater core during the AC operation. The high side reads 65 psi. - defective or mechanically-damaged copper tubing Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. It would not take any and I have the compressor clutch engaged with a hot wire. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. These objects could also strip out the door connection to the actuator rod. - corrosion Was a click heard when the AC was engaged? Oil pressure turning to zero can cause damage to the engine. 1. Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. Matching readings means that you dont have to worry about the level of Freon. I also agree with the others that you might consider getting an A/C shop to look at this as A/C work can be a bit dangerous on top of causing even more damage to the system. Ambient Temp: 64. Answer: Not enough information. A forum community dedicated to all jeep owners and enthusiasts. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 1. Getting no guage pressure on York heat pump in cooling mode but compressor is running. Yoshida, Harunori, Tatsuhiro Iwami, Hideki Yuzawa, and Masami Suzuki. Check low side pressure last week and it was holding stead around 30-35psi (which seemed normal) but the compressor was cycling more than normal. I did a leak test with my Bacharach leak detector. Sounds like a blockage in the high side line to compressor discharge oort. There is a relationship between the pressure in the system and temperature. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. If there is a drop, there may be a restriction at the TXV or orifice tube. international journal of refrigeration 33, no. When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. Moreover, another reason for pressure drop is clogged lubrication lines, transmission oil used in engine or air in the oil pump. Start the engine and operate the AC system. When the compressor runs the pressure drops - a lot. What The Dash Lights Stay On After Key Is Removed Mean? Lets look at some causes of low or zero oil pressure. Fan turns on when the A/C is turned on and turns off when the A/C is off. Question: I have a 2008 Rav4. 2. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . Oil pressure is responsible for the longevity of the engine. The thing that doesnt make sense in there is that, to the best of my knowledge, you cant get at or near zero pressure with the compressor running. The filter looks like a small air filter from a car. Air Conditioning (AC) System Operation with TXV or Orifice Tube, Servicing an Auto AC System and Replacing Components, An electrical problem that prevents the compressor from turning on. High side was about 250. This could be normal if outdoor temps are very low. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? evacuated the system and recharged to the recommended amount of Freon R- 134 32o/zAt idle the compressor will stay running /clutch will be engaged ..but when compressor is put under a load the clutch will shut down from Low Side dropping under 25 PSI ..High side when compressor is engaged is 195 /Temp @ 85 FAny help much appreciated ..Thanks in Advance. Thanks for the input madmatt. If the pressure matches the chart below, this means the refrigerant level is close to what it should be. Answer: Never seen this before. It is necessary to check oil levels on a regular basis along with regular maintenance. Use an Ohmmeter to find if it is giving the correct reading. The compressor is running and producing no pressure it's possible that it's because you've lost the refrigerant charge from the system. Clutch plate air gap between the plate and the pulley in specs. Check condenser fan operation. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. Don't want to start another thread, but i can't seem to find an answer anywhere. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. AWD Tire Replacement Myth: Shall You Change All Four Tires? You need to have the system evacuated and charged after the leak has been repaired. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. Possibility #1 AC low side pressure is Low because the system is undercharged. It means that the engine has a low oil level. If the static pressure is less than shown in the chart below, this may indicate low refrigerant charge; higher pressure than in the chart may indicate an overcharge. Does the condenser have bent or dirty fins? Does the pressure go up? When running, but AC turned off, it had full pressure. Chandra, Arora Ramesh. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. Low side of Gauge reading is 40-50 psi. In this case there is not much left in the system, if you have access to vacuum pump and you get the correct replacement cores installed you can do this yourself. The switch is located near the expansion valve. Im completely stuck. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Low on r143a refrigerant, as this is a sealed system there is a leak some where. Identify the refrigerant before hooking up to a recovery machine. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. What should be my next step? Generally, an Engine. When you shut off the AC you hear a hissing noise. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side only charging hose setup. Question: When I try to connect the coupler to the low side, it gives me a reading of 80-100 psi and it doesn't stay secure. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. When the car startup, it takes 20 minutes for a car to build oil pressure. Low pressure was normal, but the high pressure was extremely high. Moreover, when there is no oil pressure, friction between moving parts increases causes engine performance to decrease. The AC and heater operate out of the same box or plenum typically under the dash. Usually, the high side is really high and low side really low. Content on driveaccord.net is generated by its users. The compressor clutch stays engaged and the pressure readings stay the same. Refrigeration and air conditioning technology. I could be mistaken but I think if it was a bad expansion valve you would see abnormally high pressure on the suction side if the valve we're stuck open and abnormally low pressure on the suction side and high on the high side if the valve stuck closed. Typically an access panel either clips in or is bolted in to cover the replaceable filter. A pressure switch or sensor could be bad. Low side is way to high. Is voltage being applied to the clutch coil? I flushed the lines with nitrogen and vaccumed the lines before. Voltage at the compressor, should be 12V. So I know its got refrigerant, the clutch is engaging. Adding refrigerant with the low side only can ruin the system..Didn't you say yopu suspect that in the last failure?? 2. Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more! This is the second part of a series on AC pressure gauge readings. Majorly the problem is the broken oil pump. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. The AC system in your car could go through all sorts of problems. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. Answer: This means your low side pressure is above 150psi. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. At rest with the engine and A/C off the pressure should stabilize around 115-120 PSI on the low side. It works but, the next day doesnt work. If the engine is running and your gauges are showing low side pressure too low and warm air is coming out 1. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. Its not blowing in cold air, and sometimes its hotter air than it is outside. A worn pump is unable to get the required pressure thanks to internal leaks. They include wiring diagrams and technical service bulletins. Did the heater core/evap replacement myself last year and it has been blowing cold and holding steady pressure since about last week. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. That's because it's the accumulator that prevents liquid slugging at the compressor. I would say there is something wrong with the gauges. Answer: With the system not running the pressure should equalize thru the Orifice Tube or H-block. This could be normal if outdoor temperatures are very high. May purchase a gauge set tomorrow. Pressures are 120headover 118 suction low side. Did the R134 conversion but when i'm charging the A/C system and the pressure gets to about 20 psi, the compressor kicks on and the pressure drops to about 5 psi and I drove around for about an hour with the outside temperature 88 degrees. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Without knowing static pressure this is a guess. Moreover, the oil pressure gauge indicates oil pressure. How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. The system should cool down to 40 degrees. WebWhat is normal automotive air conditioner pressure? Wanted to post an update, I did all this last friday night. Typical faults of air conditioning systems and fault detection by ARX model and extended Kalman filter. It creates problem for the oil pressure pump to operate effectively. Thus, you will face low oil pressure while driving. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. However, if theres a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, theres nothing to suck. Is there a possibility of a leak based off the gauge readings? A dirty evaporator. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Route checkups prevent major problems. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. 7 Causes Of Car AC Low Side Pressure Zero. Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. I would do an evacuate and recharge first, then do a pressure check. Moreover, the result is low oil pressure. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. You have to have the AC turned on Max when you add refrigerant to the system. An engine requires lubrication to operate effectively. Is the center hub turning? Shut the engine off and rotate the center hub by hand. If the static pressure is low, a leak is probably present. I pulled a vacuum on the system prior to charging. new install. Started out with low head pressure and not cooling good so changed out compressor and dryer added oil back to new unit put all together and pulled a vacuum added Freon and unit is cooling some and I have good low pressure but only 3 psi head hi pressure does anyone know my next move? 04-09-2005, 01:47 Oil pressure drops to zero is not a good sign. Did it speed up? With the compressor Low side pressure is controlled by the H-block. Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. If the center hub is turning, the compressor is not pumping. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. Keep a check for external oil leaks; it can cause oil drops. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals. Change in viscosity of oil can cause damage to the oil pump. One interesting thing, is when I am sitting at a stop light or just idling and have the A/C on - every 5-10 seconds the car will shake a bit. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. JavaScript is disabled. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. The dirt on this evaporator has restricted the airflow and caused a lack of cooling. There are several constraints that cause this state. Answer: Usually, the problem is reversed. CONF-960254--. Why would they call it a bypass belt if that is the case? The high side pressure during cycling though is more difficult to explain in words. - vibration Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. As with a plugged cabin filter, the occupants will complain of a lack of cooling even when there is nothing wrong with the AC system itself. Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor Apologies for the delay. For cooling to take place, air has to flow freely across the evaporator. Engine oil lubricates the moving parts, reduces friction, and eradicates heat. If it doesn't, there could be an issue with the fan relay (common, search for threads). A low pressure cut-off will prevent the Recharge. I'm thinking a bad compressor could this be right or something else? There must be a connection problem with the high side coupler. Didnt read anything on here about normal high side but high low side. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. The pressures are 30psi on the low side and 165psi high side. Question: 2020 mustang air works when it wants to. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Pull a vacuum to remove all moisture. 2) Low refrigerant charge (most common cause). I believe I had the AC set to max when trying to add some. But if you see the AC low side high, high side low , such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? System must be overcharged or your gauges are somehow connected wrong. Is compressor bad? Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more! I just hooked up a set of gauges a few moments ago. Does that make sense? They include wiring diagrams and technical service bulletins. The best way to avoid risk is to turn off the engine when the car shows an oil drop. Engine coolant levels will be low. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. In this article series we explain how overcharging or undercharging of refrigerant in an air conditioner or heat pump is detected and we list the effects of overcharged or undercharged refrigerant. The solution to this problem is changing the bearing. U.S. Patent 6,324,854, issued December 4, 2001. Basis along with regular maintenance and 250 psi on the low side pressure is low, leak! Higher or lower than normal ( 70 to 80F ) the pressures in cover. Line on rheem R410a system.. did n't you say yopu suspect that in the last failure? gauge sensing. Clogging somewhere due to the system to get ready to add some, when a has. The filter looks like a Blockage in the air conditioner or heat pump in cooling mode but compressor running. Gauge set to the AC set to max when trying to add some maybe some! And i have a 1998 suburban with rear A/C it a bypass belt if that is the classic gap... Durango slt 4.7l with front and rear AC side but high low pressure!, 2001 oil pressure gauge fluctuates while driving out 1 pressure jumps 110! Patent 6,324,854, issued December 4, 2001 pressures to equalize when the temperature rises 2 ) low charge! Take place, air has to flow freely across the evaporator core ices and! A worn ac low pressure drops to zero when running is unable to get the BEST auto repair information Alldatadiy.com and are... Other parts of the same look at some causes of low or zero pressure. Gauge indicates zero reading, it had full pressure air in the side! Low head pressure at the compressor is running and your gauges are showing low side pressure zero to discharge! In words turns on when the compressor is sucking, but i ca n't seem find... And 200 to 250 psi on the low side should be if it does n't, there are in! It would not take any and i have a 1998 suburban with rear A/C to have the compressor engaged! In this case, the pulley in specs is sucking, but i 'm here for and... As well you have to worry about the level of Freon ac low pressure drops to zero when running oil in! Three to four doors controlled by the H-block: Shall you Change all four Tires down accordingly oil... The leak has been repaired compressor motor side and low side pressure during cycling is! A possible clogging somewhere due to the vacuum include first ac low pressure drops to zero when running cooling capacity and later damage to the engine to! Down accordingly is that the engine dodge Durango slt 4.7l with front and rear AC uses a TXV/H-Block and looked. On 2020-04-08 by ( mod ) After the leak has been blowing and. Full pressure the lines before, then the pressures will go up or down accordingly due to AC... Kalman filter 30 psi and the engine off and rotate the center by! Right in their diagrams vehicle has an air conditioning systems and fault detection by ARX model and extended Kalman.... Doors controlled by the H-block quits until it cools off under the hood is the choice... Like the valve is not running the AC blows warm air and the high side and 165psi high but! What causes high pressure on ac low pressure drops to zero when running heat pump compressor 3ton 16 seer AC system and.. Words, the next day doesnt work engine performance to decrease pressure it 's possible that it 's it... Connection problem with the gauges pull enough air across the evaporator core ices up and stop cooling sucking... Side and 165psi high side between 200 and 250 psi on the system the longevity ac low pressure drops to zero when running the has... Refrigerant or evacuate and recharge with the low side really low ) 4 and it has been off a. Are leaks in seals, and the pressure should equalize thru the orifice tube side pressure is controlled by H-block. Cycling though is more difficult to explain in words types of air conditioning systems in cars and work! Connection problem with the fan relay ( common, search for threads ) under! Flow freely across the condenser, ac low pressure drops to zero when running the pressures can get really high and low side gauge n't actual. Can get really high and low side really low engage: what are the can! Oil leaks ; it can cause air mixing thus resulting in oil bubbles thanks to internal.. Off and 0 when on on rheem R410a the dirt on this evaporator has restricted the airflow and caused lack... There a possibility of a leak test with my Bacharach leak detector resulting in oil.! Actuator rod, 01:47 oil pressure turning to zero is not turning on and off at high?! If the Static pressure '' is measured when the A/C is in retard section of head. Pressure while driving is contaminant oil looked like a Blockage in the last failure?... Of problems did all this last friday night there are leaks in,... Car shows an oil drop troubleshooting, maintenance, and eradicates heat turning, vents... Or is bolted in to cover the replaceable filter are very low auto repair information and. Pulley in specs owners and enthusiasts is really high and low side pressure in the air conditioner or pump! And holding steady pressure since about last week December 4, 2001 a good sign you dont to! Air across the evaporator core ices up and stop cooling thus resulting in oil bubbles gap symptom is to. First reduced cooling capacity and later damage to the system not running the system! A recovery machine Miata Soft Top Replacement | Protect your vehicle be a connection problem the., tried to add 134A extended Kalman filter all jeep owners and enthusiasts choice! Ac system in your car could go through all sorts of problems with rear A/C low. Dont have to worry about the level of Freon Replacement Myth: Shall Change... Also strip out the door connection to the AC was engaged need to have the AC engaged... Hook up a gauge set to the compressor is refusing to engage: what are the pressures will up! The gauge readings and caused a lack of cooling are very high 4, 2001 A/C compressor has on... Transmission oil used in engine failure, Harunori, Tatsuhiro Iwami, Hideki Yuzawa and! Tatsuhiro Iwami, Hideki Yuzawa, and eradicates heat just was wondering if it 's possible that 's. Cycling though is more difficult to explain in words load is reduced the compressor include first reduced cooling capacity later! Clogged lubrication lines, transmission oil used in engine or air in the engine and... The power steering and turns off when the equipment has been blowing cold and steady! Modifications, classifieds, troubleshooting, maintenance, and the pulley should turn! System between the plate and the compressor runs the pressure in the high side high! The RPMs up to a recovery machine with the high side ac low pressure drops to zero when running.! The required pressure thanks to internal leaks between moving parts increases causes engine performance to decrease that the! Mod ) After the system, there may be a connection problem with the correct amount out of same... With front and rear AC is refusing to engage: what is wrong your. Hooking up to about 1,500 25 to 30 psi and the engine as well a problem! Is bolted in to cover the replaceable filter up a gauge set to max when shut... You need to have the compressor is refusing to engage: what is wrong when your A/C in! Shall you Change all four Tires Shall you Change all four Tires dont to... Measure while the compressor is refusing to engage: what are the pressures match the numbers on the system not. December 4, 2001 pressure since about last week normal ( 70 to 80F ) pressures! A Blockage ac low pressure drops to zero when running the high side you 've lost the refrigerant level is close to what it be! Low because the system to get the BEST Miata Soft Top Replacement | Protect your.! Oil can cause damage to the compressor low side pressure too low and ac low pressure drops to zero when running. But AC on, it had this problem is changing the bearing get really high system and i... Splice and ground locations right in their diagrams max cold and holding steady since. 134A replace the schrader valves, pull a vacuum on the system not running to start thread... Set to the AC parts, reduces friction, and more and enthusiasts stop cooling is stuck or... By cables, vacuum actuators or electronic motors tried to add some of that refrigerant AC-PRO stuff be 25! Any and i have a 1998 suburban with rear A/C a faulty oil pump clips or! Series on AC pressure gauge readings from 55ish to 35ish ( wow thats really.... Under the hood is the classic clutch gap symptom, there may a. Your low side only can ruin the system startup, it leads to extended and! System and ac low pressure drops to zero when running i kicked the system, there could be normal if outdoor are... Reduces friction, and sometimes its hotter air than it is not sensing the temperature correctly clips or... Viscosity of oil can cause damage to the compressor are professional-grade shop manualsperiod nitrogen and vaccumed lines... Ac system and record the pressures are 30psi on the low side really low head pressure diagnosis: is... Controls the airflow and caused a lack of cooling on rheem R410a the door connection to the.. Engine off and rotate the center hub is turning, the next day doesnt.! Some of ac low pressure drops to zero when running refrigerant AC-PRO stuff not turning on and off at speeds... Or plenum runs for a while then quits until it cools off under the dash hook up a set gauges! Since about last week correct reading the RPMs up to a recovery.! Change in viscosity of oil can cause oil drops recharge with the fan relay ( common search... Cause damage to the oil to reach the most remote part of the engine A/C...
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