My AC Doesn't Work! Any Suggestions? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-15-2008, 10:05 PM   #1
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Default My AC Doesn't Work! Any Suggestions?

Today, I was charging the Air Conditioner on my 1995 Bonneville SE. The Low point (smaller port) is near the back, next to the Coolant Reservoir and the High point (larger port) is next to the battery. I know that it is already converted to R-134 which is standard on 1995 Bonnies I believe.

I used a 2 bottles of R-134 refrigerant and it is still blowing hot air at max. I have a pressure meter and it keeps saying 65 psi. I need help! Any suggestions?
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Old 04-16-2008, 01:35 AM   #2
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a few quick things that come to my mind when addressing AC is: too much freon, bad elctro. clutch, unseen leak, bad compressor, and i heard that if moisture enters it can affect the ac.

first research online a bit i dont know for sure what the pressure should be. but once you find out if its correct or not fix that issue.
if it is correct then to test the clutch is easy on the ac compressor there is a little plate towards the fender side of the pulley that is electronically magnatized and then in turn acts as a clutch and engages the ac pistons inside the compressor
so to test the clutch go and turn the car on and turn on the ac. then go under the hood and see if the clutch is spinning too with the pulleys or not. if the pressure is right and the clutch is not engaging it can either be to far gapped or have a bad clutch if your are for sure the clutch is not spinning you can stick a screwdriver near it and if should pull the screwdriver to it if its good if it doesnt its bad.
ok on with the compressor if the pressure is correct and you can see the clutch spinning in unison with the pulley and belt then it is probably an issue inside the compressor there are plenty of seals that can go bad inside of one.

oh by the way an easy way to rule out leaks is getting some UV dye from the auto store and pour it in then get a UV light and glasses and any leak shows up flourescent pink or yellow depending on what brand you get

so long story short in order of importance:
add the dye and make life easier on yourself
make sure the pressure is correct
then check the clutch for full engagement into the pulley assembly
then if all the others are good i would replace the compressor
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Old 04-16-2008, 11:02 AM   #3
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Thanks for the help! I'll try it out.
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Old 04-16-2008, 12:49 PM   #4
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What were the symptoms you were having or what tests did you do to determine that your A/C needed recharging? For a '97 the right low pressure is about 30-35 lbs. and I think the compressor for a '95 is the same as a '97, but not 100% sure. There is one possiblity for not having cold air that is not directly related to the A/C system under the hood, and that is a failed airmix actuator under the dash. It is easy to insect, unless you know for sure your freon was low and or there was a problem with the compressor or a leak that you knew about.

Here is what I found for a '97.

Temp----------Humidity---------Low Side (in psig)-------High Side (in psig)--------A/C Discharge Temp
60*F-70*F----Low (<40)-------23-31 psig-------------------140-190 psig--------------39*-49*
60*F-70*F----High--------------25-33 psig-------------------155-200 psig--------------42*-50*

80*F-----------Low (<40)-------27-35 psig-------------------165-220 psig--------------45*-54*
80*F-----------High--------------29-37 psig-------------------185-245 psig--------------47*-57*

90*F-----------Low (<40)-------34-42 psig-------------------185-260 psig--------------50*-60*
90*F-----------High--------------37-45 psig-------------------190-280 psig--------------53*-63*

100*F----------Low (<40)-------38-48 psig-------------------200-300 psig--------------55*-65*
100*F----------High--------------39-49 psig-------------------210-310 psig--------------55*-65*

110*F----------Low (<40)-------42-55 psig-------------------230-340 psig--------------60*-70*
110*F----------High--------------42-55 psig-------------------230-350 psig--------------60*-70*

A/C pressure switch set points to disengauge the A/C clutch are 730 psi and 44 psi.
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