90 AC - system functions, electrical relay not enabling - Saab 900 Bulletin Board - Saabnet.com
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90 AC - system functions, electrical relay not enabling
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Posted by DET (more from DET) on Wed, 10 Aug 2005 10:37:37 Share Post by Email
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All,

I've been pulling what is left of my hair out trying to get my AC to function on my 90 Turbo. The status is this:

1. AC compressor is functional with "straight wire" to the compressor lead.
2. The system has a good "sweat back" on the suction line right at the compressor and also at the evaporator....this unit was just working very well a few weeks ago; one of the last R12 cans in existence was called into service (thanks Dad) and the unit was blowing quite cold air.
3. I have confirmed that ALL upstream sensors are working correctly, as I have pulled the AC relay and checked for 12v signal to the relay. For folks with a Bentley, I have 12v on terminals 30, 86 (primary supply thru all sensors), 15, and TK. However neither outputs 87 or 87B will energize
when the relay was installed.
4. I have tried a spare AC relay, same part# from an 89, no change.
5. I believe the downstream AC diode is OK, because when I jumpered 12v direct to terminal 87B, the AC runs.

The only things I can't check yet, are the LH control unit, or the throttle angle transmitter (200 and 203 in Bentley). Another input to relay is 16, which is now reading 0 volts when car is running.

I would appreciate the electrical Guru's thinking on this one, as it is mid 90's here every day in NC, and I sure need this AC working!

thanks in advance,

DET


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