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Ac compressor kicks on when low side pressure is 85 to 90 psi and kicks back out at 13psi

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You need to add some Freon so low side holds steady at 20-25 PSI.

Posted on May 17, 2017

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I have a 2002 Trail Blazer it not cooling The compressor kick in and out and low side reading 150? What do I need to check?


It's impossible for the low side to read 150 PSI, typical pressure is 35 - 45 PSI. Are you sure you are on the low side and not on the high side? If your compressor is going on and off, maybe your pressure switch is bad or the low side pressure is too low.

Aug 15, 2011 | Chevrolet TrailBlazer Cars & Trucks

2 Answers

When i turn on the a/c,the compressor does not work


CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.

Aug 11, 2011 | 1997 Nissan Pathfinder

1 Answer

When idling the a/C compressor just kicks on for a few seconds then disengages


You need to add some refrigerant (R134). Whats happening is that since it is low on regrigerant the compressor sucks the low side below the cutt off pressure turning off the compressor, then pressure at the low side builds up again quickly and turns the compressor on again then sucks it back down again untill it turns off and the cycel goes on and on untill you add enough regrigerant in there. Here are some caution do not overcharge the system. Overcharging will make it not get cold properly and will damage the compressor costing you a lot more money. The low side should reach a minimum of 35 psi with the AC blower on maximum. This keeps the compressor on all the time. If say you were to put the blower on minimum the evaporator would get really cold since the air passing through it is less. This would cause the low side pressure to dip down gradually until the compressor cuts off, and that is how the system basically works

May 28, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Where is the low pressure ac valve?


FOLLOW THE REFRIGERANT LINE LEADING FROM AC COMPRESSOR TO EVAPORATOR TO THE BACK FIREWALL LOOK FOR REFRIGERANT LINE WITH BLACK OR BLUE CAP THATS LOW PRESSURE SUCTION SIDE..WHEN HANDLING REFRIGERANT WEAR SAFETY GOGGLES TO KEEP REFRIGERANT GETTING INTO YOUR EYES.WHICH CAN CAUSE BLINDNESS OR DAMAGE EYES.YOU NEED A LOW AND HIGH PRESSURE GAUGE.OR MANIFOLD GAUGE SET.LOW SIDE PRESSURE SHOULD BE 28 PSI AND HIGH SIDE SHOULD BE 200 - 220 PSI.

Feb 20, 2011 | 1991 Mazda 626

1 Answer

No ac.......worked yesterday, not today


CHECK BLOWER MOTOR FUSE AND RELAY.IF BLOWER MOTOR GOOD STILL BLOWING.CHECK AC COMPRESSOR FUSE AND RELAY.IF COMPRESSOR FUSE AND RELAY GOOD.CHECK AC LOW SIDE PRESSURE SHOULD BE 28 - 30 PSI AND HIGH SIDE PRESSURE SHOULD BE 200 - 220 PSI. IF PRESSURE GOOD THE COMPRESSOR CLUTCH COIL COULD OPEN.CHECK DRIVE BELT MAKE SURE NOT LOOSE AND SLIPPING.

Oct 24, 2010 | 2005 Nissan Frontier

1 Answer

2003 Kia Sedona, had ac problem last year replaced compressor, dryer, and now TXV valve, recharged system with approx 35 oz and have 135 psi in the system and the compressor will not kick on?????


You have too much pressure on the system. When the AC is on there should only be around 50 psi on the low side. Otherwise your taking a chance on blowing the seals or blowing the compressor. with that much on the system already I would hope the safety switch has kicked in a disabled the compressor so it doesn't blow your lines.

Jul 31, 2010 | 2003 Kia Sedona

1 Answer

A/C compressor kicks off when low side pressure hits 35-40 psi. Why is this?


COMPRESSOR WILL KICKS OFF IF PRESSURE TOO HIGH.OR PREVENT AC SYSTEM FROM FREEZEN UP.

Jun 29, 2010 | 1993 Jeep Grand Cherokee

1 Answer

Need air cindition recharge, don't have cash to take it someplace, can you help with instructions to do this


YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.

Jun 26, 2010 | 2004 Hyundai Elantra

2 Answers

My 99 s10 blazer has ac problems. i tried to fill the refrigerant and the psi bounces between 55 and 20, it starts at 20 the builds to 55, then the clutch kicks on and the psi drops back dowm to 20. this...


I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.

Jun 21, 2010 | 1999 Chevrolet Blazer

1 Answer

A c starts off cooling good then compressor starts kicking in and


Several possible causes. Knowing the state of refrigerant charge would be helpful. Assuming it has a 'full' charge (full charge 680 Grams = 1.50 Pounds) Most common causes of AC problems:
1. Thermostatic switch (sensor) malfunction in the evaporator - allowing the evaporator to ice up. Check the vent temperature (using a cooking thermometer) to see if the temperature gets near or below freezing (32 Deg F.). If so, the thermostatic switch in the evaporator is defective. Replace it.
2. Refrigerant UNDER-charge. If the temperature does NOT get near freezing, then you need a set of AC gauges to check the compressor head pressure (High side) and the suction (Low side). High side pressure (nominal) is 229 PSI (+ - 20 psi) @ 2000 RPM. Low side (nominal) is around 20 to 40 psi. NOT common problems:
1. The magnetic clutch coil on the compressor... as it heats/warms up, the coil windings could be going 'open" circuit which would turn the compressor 'off.'
2. Compressor inefficiency (worn out).
3. Expansion Valve
4. Clogged Condensor

Mar 19, 2009 | 2004 Hyundai Elantra

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