2002 Oldsmobile Silhouette air coditioning

PAWNEE

MEMBER
2002 OLDSMOBILE SILHOUETTE
3.4L
6 CYL
2WD
AUTOMATIC
76,000 MILES

My air conditioning doesn't get cold/I do not hear compressor turn on even with highest setting/doors open etc. /Should I hear it come on when adjusting temp. Control from heat to cool? It's been recharged with R134 Freon so that's not the problem/no fuses appear to be bad in fuse panels both inside and under hood/ A frien said his Chev. Venture van had a wire worn thru from rubbing on frame down where comp. Is located but really hope we don't have to dig down that far! Can you give me any insight on my problem? I wonder if temp control dial is working right to engage compressor when dialed to cold! Thank You in advance as I have loved the vehicle and I'm disabled with a lift in rear for power chair Duane Heath

Saturday, May 3rd, 2014 AT 4:18 PM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

We need to start with what the pressure is of the high and low side of the system anytime there is an issue with the compressor not coming on.

Basically we can go through the entire system and if the pressure is assumed to be ok then we will never fix it.

Here is a guide that will help with this:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Once we know what the pressure is on the static system we can jump the relay to make sure the compressor comes on and actually builds pressure and the system blows code. This will confirm the entire system works and just focus on the control side.

At that point, you want to go to the pressure switch on the accumulator and check voltage. Start with unplugging the sensor and checking the gray wire for 5 volts from the PCM. If you don't have 5 volts then the PCM is the issue.

If you do then we need to check ground from the PCM using the black wire as your ground to check the 5 volt gray wire if you did not do that previously. You should still have 5 volts. This confirms the PCM and wiring is okay.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Lastly we need to monitor the voltage on the signal wire by plugging it back in and back probing the red and black wire.

This is a 3 wire sensor so you cannot just jump it as the PCM needs to see a pressure signal in order to turn the compressor on.

Please run through this material and let us know what you find with this and we can go from there. Below are the attachments needed for this.

Thanks

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