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A/C HELP
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Posted by saabsince 93b [Email] (#972) [Profile/Gallery] (more from saabsince 93b) on Wed, 26 Jul 2017 16:22:37 Share Post by Email
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I am currently working on the A/C on a 2003 and a 2004 Saab Aeros.

The most puzzling is the 2004 which has had a couple of leaks fixed. It vacuumed down really well and held the vacuum, so I have lots of confidence in the integrity of the refrigerant part. I then serviced with the right amount of R134a.

It cooled very well initially and now the computer will no longer provide ground to the a/c compressor relay. If I jump the relay the compressor starts and I get good cold air and the Tech 2 tells me good pressure of 18 bar or so.

The electric fans don't run and the evaporator temp is 41 degrees F. Never moves.

I have studied all the inputs the computer needs to ground the relay. I am wondering if the Evaporator sensor is stuck at 41 degrees or is defective.

The 2003 also shows the evaporator temp at 41 degrees. This one does still have a leak, so I have to fix that first.

Will a bad temp sender at the evaporator stop the A/C compressor from turning on?

Any suggestions?? 
_______________________________________
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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