Help: A/c Problems
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
It is also important to know if you ave a MANUAL AC system or an AUTOMATIC AC system.. In other words "Duel Climate Control"
I looked up the operating system pressure and it will be 28-32 psi low side depending on the outside air temp. High side will be 119-260 PSI depending on the outlet air temp.
BC
I looked up the operating system pressure and it will be 28-32 psi low side depending on the outside air temp. High side will be 119-260 PSI depending on the outlet air temp.
BC
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From: CORNELIA GA
Originally Posted by Bill Curlee
It is also important to know if you ave a MANUAL AC system or an AUTOMATIC AC system.. In other words "Duel Climate Control"
I looked up the operating system pressure and it will be 28-32 psi low side depending on the outside air temp. High side will be 119-260 PSI depending on the outlet air temp.
BC
I looked up the operating system pressure and it will be 28-32 psi low side depending on the outside air temp. High side will be 119-260 PSI depending on the outlet air temp.
BC
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Those HIGH pressures are read on the HIGH Pressure side with the AC compressor "RUNNUNG". You will not see those types of pressures on the system with the compressor off. The pressure in the HIGH and LOW side equalize when the system is OFF and will read close to the same on each side. (around 50-70 psi as a good SWAG)
So,,,,,,,,unless the system is running, dont look for those pressures.
BC
So,,,,,,,,unless the system is running, dont look for those pressures.
BC
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From: Wa
I had the same problem, what it was, there was pressure built up in the system and read normal and no 134A in it so the pump would come on and all there was is hotair. I bled off the pressure and recharged it and it worked fine then.
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From: CORNELIA GA
Just got my car back and "I HAVE A-I-R". It was the Air Temp Sensor--GM Part #10248414. The outside air temp sensor is located in the RH front of the engine compartment, on the radiator support near the horn assembly. Hope this helps. JOHN 
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From: CORNELIA GA
Originally Posted by BrentNY
Well my car goes in today for the flickering light. I know i have a full charge so I'm hoping it is a electrical problem and not the compressor. Will let you know.
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From: CORNELIA GA
Originally Posted by BrentNY
John, thanks for the update. Were you getting erratic outside temps on your contol unit? Thanks, Brent
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Joined: Jan 2001
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From: Hilton NY
If there is a relay for the compressor clutch then pull the relay and jump across where the relay contacts plug in, check the relay cover for pin outs. If the clutch operates in the above manner then the problem is before the relay, don't run it this way for long because any high pressure protection switch will be bypassed.
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From: CORNELIA GA
Originally Posted by BrentNY
Well my car goes in today for the flickering light. I know i have a full charge so I'm hoping it is a electrical problem and not the compressor. Will let you know.
Racer
Joined: Aug 2003
Posts: 484
Likes: 1
From: Merrimack NH
John and anyone following this thread I did get it back. . There wasnt a good ground to the pressure sensor. That simple. He installed a new pressure sensor anyway so I'm not positive if it was the sensor or the loose ground. Anyway it's fixed and no more flickering lights and I have cold air.
Brent
Brent