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my experience
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Posted by saabsince 93b [Email] (#972) [Profile/Gallery] (more from saabsince 93b) on Tue, 5 Jun 2012 10:24:31 Share Post by Email
In Reply to: jump the relay?, AeroEd, Tue, 5 Jun 2012 09:16:12
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I had a similar problem which was the pressure sensor at the condensor had the cable broken off. The ACC needs a reading from the pressure Sensor to send a signal to the ECU to provide ground for the AC relay. There are other inputs like over temp.

You should be able to get a code out of the ACC with a Tech2 .......that is how we found my problem. I also found it with an OP CON unit hooked to my PC.....code was shorted or dis connected pressure sensor. To get to this sensor you have to take out the passenger side headlight and it is right there on that end of the condenser which is the first radiator to the front.

When I did the A/C reset, this defect gave me a code 22 which interpreted to a software error, but was really this disconnected sensor. So if you get a code 22 check the pressure sensor.

You can check the compressor by providing ground at the A/C compressor relay....this is what the ECU does. Or you can provide 12VDC at the compressor connector behind the passenger headlighj to see if the compressor is working.

Good luck.....I have been there!! 

_______________________________________
NOW OWN:
2000 95 Imola Red Aero 5 door stick - my ride
HAVE OWNED:
2003 95 Black Aero 4 door auto Mary Ann's car
2004 95 Black Aero 5 door wagon 
2001 95 Silver Aero 4 door stick
2001 95 Silver Aero 5 door wagon automatic
1999 95 Combi stick
1997 9000 Aero stick red
1988 900 SPG black
1988 900 Convertible black
1985 900 3 door turbo spg kit silver
1979 900 3 door turbo early 900 production
1966 96 2 stroke red
1960 95 wagon red
1959 93b light yellow
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