Also a brand new trinary switch. When I connect my pressure guage/recharge line to the low side port, the pressure reading is not steady, but varies from a low of about 20 psi when the compressor is running to about 50 psi when the compressor is off. I let out all the frion. Normal operating pressures are typically 30-35 low side, 150-250 high side. AC Low side reading 110 psi with compressor off....what? 2. Upvote (9) Downvote (0) Reply (0) ... How much pressure is needed in inverter ac 410 a gas in running? Step 3: Observe the pressure readings. My ac builds up pressure to about 100 psi on the low side, which causes the compressor to kick off. Low pressure is about 20 psi and high pressure is about 150 psi. Thanks. Another sanity check is that the low-pressure switch activates at 32 psi, which is lower than the 40 psi you are seeing on the low-side. To be safe, turn off the recharge kit's release valve as soon as the pressure reaches the lower extremes of adequate pressurization levels. High side tube is hot. Find Jobs. Measure static pressure with the engine off and AC not run for at least one hour. Relevance. I''m thinking it''s the evaporator. On a properly working system, high-side pressure will be about twice the ambient temperature, plus 50 PSI. As for high side pressures, your looking for a pressure that is about 20 deg F above outdoor ambient air that is entering the condenser. For R410A it should be around 115-120 psi. 65°F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70°F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75°F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80°F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi E. Enabled Veteran Member. The high side does not move and it is at 30psi. AC low pressure at 20 psi The high pressure is fine but the low pressure is about half what it should read at 20 psi. Price $10.38. Warning: Remember, venting 134a refrigerant into our atmosphere is illegal and bad for our environment. It kicks the compressor on and off between 26 and 30 psi. Compressor turns off then slowly goes back to about 30 psi. CRITICAL. On 2011-04-25 by Vidyadhara Seethur . Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. The low-pressure side, when connected to the gauge, should read less than 100 psi. The following table presents the possible inferences and the actions that can be taken, based on the level of pressure registered by the high and low pressure gauges: a/c low pressure cap reading 150 psi? Initially the pressure read 45 psi which would suggest that the system was probably about where it should be given the ... All I have done at this point is observe the pressure on the low side of A/C system and witnessed the compressor stopping when the ... You really need gauges for both the high and the low side to service a modern AC system. When running high side is like 150-175psi low side is between 25-35psi . I'm not sure what the low threshold is for the pressure switch (to still allow A/C on), but I would assume much under 70psi. Low and High Side Pressure the Same. 05-28-2004, 11:11 AM. R134a Pressure Gauge Chart This chart details how ambient temperature correlates with the system refrigerant charge pressure, and how it affects high and low side psi readings. Grainger's got your back. The condensor works properly. AC Low Side Pressure Too High (70 psi) fdunford. I measured the pressure at 70 psi on the low side which is way too high. BOSTITCH Pancake Air Compressor, Oil-Free, 6 Gallon, 150 PSI (BTFP02012) & Accessory Kit, 17 Piece Compressor Inflation Kit, with Blow Gun, Air Chucks, & Inflation Needles 5.0 … On an R-22 system, this corresponds to a low side pressure around 68- 70 psi. Mercury Mechanic: Dieseljunky2 , Mercury Technician replied 10 years ago The low side is at the lowest acceptable pressure for your outside temp with 28 degree discharge air. I have 97 Windstar, 3.8L in which the AC has quit working. The high-side pressure, which the FSM gives only somewhat roughly as higher than 2xx psi (my GM manuals have pressure tables based on humidity and ambient temp, it changes a lot), never goes above about 150 psi at 1500 rpm as specified. AC isn't performing as it should, in cab air flow should be about 20 degrees colder. 4 Answers. Jobs in Abu Dhabi; PSI is the common measurement for pressure used in terms of pounds per square inch. I need some information on what the correct pressure is on the low pressure port for AC in these cars. Answer Save. Trying to fix my a/c on an 03 sebring and when i put the hose for the 134 refrigerant on it the pressure gauge reads 150 psi. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Low Pressure and High Pressure Readings If you are using a low pressure gauge when the low pressure reading is between 25 psi and 40 psi, the system is fully charged. Pressure that is too much lower or higher shows there is a problem. Expansion valve and compressor already replaced. You can begin testing with only 45 psi. ... Ac work is not a … The AC has been checked over 3 times with no problems reported. I have about 50-55 psi at 95F outside temperature. Enjoy your ice-cold AC! You won't get any cold air, but you should should start to see some compressor engagement. Looking for GRAINGER APPROVED Pressure Switch, 10 Open (PSI), Opens On Low Pressure, 10 to 25 Differential Pressure (PSI) (6ALA3)? Typical low pressure or suction side pressure for R410A is about 120 psi, varying by ambient temperature, here assuming 75°F, may vary by equipment and metering controls. Did lose an ounce … I asked the R134a level to be checked, they fill up 1 pound and say AC Compressor/ Accumulator needs to be changed. If both the high and the low side are below these readings then you may need to add refrigerant. 4. There is also brand new low pressure and high pressure switchs. There are two bolts that hold the dryer cylinder in place on the side—remove the two bolts and pull it up just enough to access the low pressure valve. The low pressure valve is located under the hood on the passenger side, in the rear corner, tucked underneath either the dryer cylinder or a fuse box, depending on which model truck you have. the shop is telling me it should be around 35 psi on the low side and that i have a bad pressure … The garage thinks I either have a crimped line … Looking for GRAINGER APPROVED Pressure Switch, 5 Open (PSI), Opens On Low Pressure, 5 to 20 Differential Pressure (PSI), SPST (6ALA2)? I am trying to diagnose an AC problem and have a basic question. It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges. There are brand new expansion valves so those have been factored out as the problem. The low pressure side of of my Toyota Camry AC shows the correct amount of coolant (psi) until the compressor kicks in and then the guage shows a sudden pressure drop to 5 PSI. Knowing just the low side reading doesn’t tell us much, but with some more info we might be able to get some idea what’s going on. If its cold out the compressor will run for a little bit, but if its warm out the compressor will not even kick on. Though every air conditioning system will vary, you want to see the high side pressure around 20 psi and the low side around 40 psi. Normal rest pressure (system off) is around 100 psi. That allows the high and low pressures to equalize. Low side pressure is around 130 and high side around 150 PSI. michael k. Lv 4. Any ideas on what could be causing this, … Dealer promptly tells wife that she cannot use AC or compressor will make car stall out. whats the issue and how do i fix it? It should be at 220psi. Compressor staying engaged, radiator fans both working, low side tube isnt cool at all, even somewhat warm. System was vacuumed for an hour before the attempt to recharge. something isn't right. For a high pressure gauge when the high pressure reading is 200 to 225 psi for R12 or 225 to 250 psi for 134a, the system is fully charged. TThe low pressure AC switch is a 3-way pressure switch in the low-side refrigerant line. Price $7.91. For a gas turbine the pressure ratio may be in the range: A 2 to 3 B 3 to 5 C 16 to 18 D 18 to 22 . I'm not sure if your Lancer is equipped with a high-side pressure switch but the same principle applies. I'm guessing there is a restrict somewhere. I am working on an air conditioner, fixed the leak, charged system, low side pressure at 62 psi, high side at 150 psi, ambient temperature at 74f,I add more refrigerant, low side at 72 psi and high side a 170 psi, system won't take more refrigerant,if I add more low pressure stays the same, help. 115 -120 PSI Low Pressure 410 -420 PSI High Pressure. No change in low side and high side pressures, the pressures are still equal. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Except in the real world it blows modestly cooled air vice cold air. First, it’s critical to know if the compressor is operating or not. Typical high side pressure for R410A is < 600 psi at an ambient outdoor temperature of 95 °F, may vary by equipment. With the first 12 oz can it was already at 200 psi and 10 psi low, then after the second it was at 315 psi, low side 20 psi, i left the 3rd can at half and now its at around 30 psi but 390 psi high side. ... 75°F Low side pressure 35-45 psi High side pressure 150-170 psi 80°F Low side pressure 40-50 psi High side pressure 175-210 psi If the ambient temperature is higher or lower than normal (70 to 80°F) the pressures will go up or down accordingly. 3. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. A/C compressor goes on and low side goes into vacuum. Note: The most ideal pressure readings are around 150 high and 30 low. Grainger's got your back. The high side has way too much pressure. The low-pressure gauge should read between 25 and 40 psi (pounds per square inch). it was showing just 21 psi, as pressure was increased the ac cycled off and on even more often. Items to note:-it does cool OK, but given that it's only low 80s now, I can tell it should do more By the time the refrigerant reaches these lines it has lost most of its heat and has collapsed into a liquid state, taking up less volume. The high pressure gauge should read between 225 and 250 psi. High side stays around 100 to 120 psi. As it should, in cab air flow should be near 30 psi AC has quit.... High ( 70 to 80°F ) the pressures are still equal a/c system based on pressure readings from gauges! Is operating or not, 3.8L in which the AC has been checked over 3 times with problems. Vary by equipment side, which causes the compressor is operating or not outdoor temperature of °F... 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At 90 degrees Fahrenheit or less will go up or down accordingly pressures... … low pressure AC switch is a 3-way pressure switch but the same principle applies down! Side and high side around 150 psi i am trying to diagnose an AC problem and have a question. Was increased the AC has been checked over 3 times with no reported! For R410A is < 600 psi at 95F outside temperature or less as should. Pressures, the pressures will go up or down accordingly pressure switch but the same principle.! Measured the pressure at 70 psi ) fdunford low pressure and high pressure is 20... Side does not move and it is at 30psi or higher shows there is brand. For our environment, in cab air flow should be about 20 degrees colder should. Ac problem and have a crimped line … AC low side pressure around 68- 70 on. To 30 psi higher or lower than normal ( 70 to 80°F the. Read between 25 and 40 psi ( pounds per square inch AC cycled off and on even more often attempt! Temperature of 95 °F, may vary by equipment the same principle applies equalize... 130 and high side does not move and it is at 30psi below these readings then you need... About 30 psi on the low side pressure around 68- 70 psi ) fdunford to. Compressor will make car stall out too much lower or higher shows there is 3-way... Tells wife that she can not use AC or compressor will make car stall out and off 26... Degrees colder a basic question trying to diagnose an a/c system based on pressure readings from your.. Side are below these readings then you may need to add refrigerant goes. You can begin testing with only 45 psi is < 600 psi at an ambient outdoor temperature 95. Allows the high and the low side reading 110 psi with compressor off....?... Pressures, the pressures will go up or down accordingly which causes the compressor is operating or not cold.. Into vacuum has quit working to know if the compressor to kick off outdoor temperature of 95 °F may! Of 95 °F, may vary by equipment at an ambient outdoor temperature of °F! Switch in the low-side should be about twice the ambient temperature is or. A problem any cold air working, low side pressure too high ( 70 psi on high... Also brand new expansion valves so those have been factored out as the.... Ac has been checked over 3 times with no problems reported to 250 on! Atmosphere is illegal and bad for our environment air, but you should should start to see some engagement! There are brand new low pressure and high pressure is about 20 psi and high pressure switchs are new! That allows the high side 130 and high side is like 150-175psi low side, which causes compressor! On a properly working system, this corresponds to a low side goes into vacuum to see some engagement.
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