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Comp runs no cool?

Prospeeder on Fri July 31, 2009 7:16 PM User is offlineView users profile

Year: 1990
Make: Pontiac
Model: Grand Prix
Engine Size: 3.1T
Refrigerant Type: R12
Ambient Temp: 80
Pressure Low: 110
Pressure High: 79
Country of Origin: United States

Im trying to diagnose this system, as its an R12 system that has never been open. It has only 80k on it, and Im the second owner, and the A/C has never been touched. It decided to stop blowing cold. We hooked up gauges, and it was like 30/120 or so, so we tried adding some R12, big mistake, the pressures went real crazy, and the low went high and the high went low. Compressor clutch still enguages and spins. This is the V5 compressor. We tried evacuating a little refrigerant but no change. Im afraid my compressor may have somehow died. the compressor runs nice and quiet and spins free. Odd thing is i drove it like 20 miles with the a/c on and suddenly it worked for awhile, but wouldnt work again after I shut it down. Where should I start? I havent disassembled the system as its very burried in this car.

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1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C

Chick on Fri July 31, 2009 9:11 PM User is offlineView users profile

Your refrigerant control valve may be stuck, try taking the pressures again and see if there is a change, there should be if it started cooling again.. Anyway, if you have a leak, most likely a front shaft seal, you might want to consider changing the compressor if you don't have the tools to fix it (confirm leaks first) If it is leaking check out 90 grand prix 3.1 for a good reman and accumulator and O tube.. If not, you can change the refrigerant control valve.. (System must be empty) it faces straight down, and you can sometimes remove it without removing the compressor.. then recharge it..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Prospeeder on Fri July 31, 2009 9:43 PM User is offlineView users profile

Im in school for automotive technology and have taken a course in A/C. So the control valve is replacable outside the compressor? The systems full, just the pressures really dont respond. I cant get it to get cool again. I work at napa and can get a Reman 4 seasons compressor for less than 180 bucks, and all the other stuff for next to nothin. I am going to replace the condensor also. But it does sound like the compressor control valve is stuck? The car does most of its life sitting, i tend to try and keep miles off it. Its a shame my 230k 6000 with original R12 still blows ice cold, 34 degree duct temps, while my 90 with 80k on it is dead. Bleh.

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1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C

TRB on Fri July 31, 2009 10:08 PM User is offlineView users profile

Four Seasons are known to be horrible reman compressors!

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GM Tech on Fri July 31, 2009 10:41 PM User is offline

I've taken 6 or 7 four Seizens off cars because of pulley failures- and "walk-homes" - I'd sooner put on a used pump, then a rebult unit....at least it was not messed up.....

You probably have a leaky evap and shaft seal-- known failure modes on your vehicle....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Prospeeder on Sat August 01, 2009 4:47 PM User is offlineView users profile

its full of refrigerant, and the compressor runs, it just blows warm. No leaks, probably is the control valve sticking in the compressor. Iv been working here at napa for a few years and havent ever had a compressor back on warrenty or had people complain about them.

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1990 Pontiac Turbo Grand Prix
1990 Pontiac 6000 LE V6
Both have R12 A/C

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