Question about 2001 Pontiac Montana

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Low side 45 high side 225 outside 85 compressor isn't cycling why

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Are your cooling fans coming on???

Posted on Jul 20, 2010

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1 Answer

How do I recharge the AC on a 2002 Chevrolt Malibu?


The only way to know if a vehicle's air condition is properly charged is to use refrigerant gauges to determine the high side and low side pressure while the system is running. Without gauges, there are a few things you can check:
  1. With ambient temperature over 85 degrees Fahrenheit, when you first start the engine for the day, the compressor should engage and stay engaged. If it cycles off and on for more than one minute, or if the compressor fails to engage at all, there is a likelihood that the refrigerant charge is low. (If ambient temperature is under 85 degrees Fahrenheit, a small amount of cycling is normal, but the compressor should remain engaged for a longer time than it is disengaged);
  2. If the compressor is not engaging at all, momentarily place a wire jumper across the two pins of the refrigerant pressure switch connector with the engine running and the system on. The compressor should engage. If it does not, the system is not working properly. If it does, there is likely insufficient refrigerant in the system.

Jun 18, 2014 | 2002 Chevrolet Malibu

1 Answer

Ac short cycle


You have air in the system if you didn't pull a deep vacuum
for 2 hours & let it sit over night to see of it holds.

Jul 08, 2013 | 2003 Dodge Neon

1 Answer

Forester ac compressor cycles every few seconds but pressure on lp side shows high in gauge


Is it possible you hooked up to the factory service port on the high side instead of the low side port ?
Can you hook up a set of gauges to both high and low ports ?

Jul 27, 2012 | Cars & Trucks

1 Answer

98 expedition with dual air. pressures were 50 and 225 at idle at 90 - 95 deg outside. Compressor cycled and air got warm when driving. Added 12 OZ of freon. pressures went 60 and 250. added another can...


sounds like the expansion valve or the orfice may be clogged is your compressor making noise like a clinging inside if it isyou'l need to change the accumlator dryer as well as expansion or orfice along with the compressor. you could try what are the pressures with a fan in front of the vehicle if they go to 35-40 psi on low side and 200-250 psi on high side these are close to where they should be.

Jul 07, 2012 | 1998 Ford Expedition

3 Answers

Replaced the ac compressor but now no power to compressor but have power to low and high pressure switches. checked relay under hood, relay and fuse in cabin. what am i missing?


Put a jump wire in the high pressure switch plug. If the compressor works. replace the high pressure switch. Let me know and we can go from there.

Aug 22, 2011 | 1999 Ford Expedition

1 Answer

Actually a 2000 F-450, did not see a space for that year. 7.3 diesel. A/C issue. When first started up the A/C works fine, gets cold. But if I shut off the air for any reason the compressor will not cycle...


The A/C low side should read between 30 and 35 psi. Refrigerant pressure is indicative of its temperature, and 55 psi on the low side is too high and would only provide 60 degree air at the vents.

Aug 07, 2011 | 1999 Ford Super Duty F 450

1 Answer

What psi should my compressor be at


about 35-45 on the low side and 225-250 on the high side.

Aug 17, 2010 | 1991 Buick Century

1 Answer

What is the required high and low pressure for grand prix 1999. 3800 v6 -3.8L.


A/C pressures when running? Low side 35-45 High side 225-275

Aug 11, 2010 | 1999 Pontiac Grand Prix

2 Answers

I have a 1996 geo tracker I cant get the compressor to run I have relpaced the compressor relay which dosent help. freon is ok compressor cluch kicks in when direct wired.


does the compressor run when bypass the compressor thermal cutout switch on the compressor? here is the part number and a picture.
also does it run when u bypass/jump the compressor cycling switch? it is located in the low side of the sytem, thios is the line that is the larger of the two, hwere is the part # and picture.

1. compressure cutout switch (3 diff ones used)
FOUR SEASONS Part # 35756
Compressor Mounted Cut-Out Switch; 1 Term White
type two
FOUR SEASONS Part # 35973
Compressor Mounted Cut-Out Switch; 2 Term; Blue or Green; Low Pressure
type 3
FOUR SEASONS Part # 35970
Compressor Mounted Cut-Out Switch; 2 Term; Yellow

d2d2a20.jpgthis is type one and two, two wires.

next is type 3 one wire.
06d325f.jpg Next is the low side compressor cycling switch, most common problem.

ACDELCO Part # 155606 {#96069320}
SWITCH,A/C CYCLING

2c15c22.jpg

Nov 02, 2009 | 1996 Geo Tracker 2 Door

2 Answers

96 Tahoe no Cold Air


YOU NEED 28 PSI ON LOW SIDE AND ABOUT 190 ON HIGH SIDE.YOUR REFRIGERANT IS LOW THAT WHY COMPRESSOR CYCLING ON AND OFF.

Jul 22, 2009 | 1996 Chevrolet Tahoe

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