Mechanics

AC

2002 Pontiac Grand Am • 4 cylinder 2WD Automatic • 84,000 miles

My 2002 grand am's AC turns on and off. Ck engine light came on AC wouldn't turn on then I shut down the car try again no light on and AC works
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Ricks2002
August 21, 2011.



Check engine light on
http://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.

Rasmataz
Aug 21, 2011.
First thing you need to do is go to a auto parts store and have them scan it for codes. Then let me know what the exact code numbers are. Also if the ac still works.

Saturntech9
Aug 21, 2011.
What's weird no codes. The only time it seems that the AC doesn't work is if you leave it on turn off the car they turn the car back on sometimes the AC won't turn on however if you turn the AC off before turning off the car then turn on the car then the AC no issues.
Any thoughts

Tiny
Ricks2002
Aug 21, 2011.
Do you have auto climate control?Or is it manual?If your getting a check engine light with no codes then they probably used a basic code reader that only reads engine and transmission codes. Not body control module air bag hvac codes etc. So you probably have codes set in another computer.

Saturntech9
Aug 22, 2011.
Manual auto climate

Tiny
Ricks2002
Aug 22, 2011.
So you dial in the temp you want on the display?

Saturntech9
Aug 22, 2011.
Its not digital just a dial with the red/blue and you move it to the temperature you want. No digital reading, the basic manual ac system

Tiny
Ricks2002
Aug 22, 2011.
Alright you threw me off when you said it was a manual auto climate control. When the ac shuts off while driving is the car running too hot or overheating?Are the electric fans working like they should?Also I would clean all the fins on the radiator and ac condensor of all the debris that might be trapped in them. After that will be checking the high and low ac pressures.

Saturntech9
Aug 22, 2011.