Posted by ted regentin on September 27, 2009 at 06:39:06 from (69.1.112.198):
In Reply to: Auto air question posted by Roy in Ga on September 26, 2009 at 19:06:19:
Here is how the system works. The control head sends 12v. to the low pressure cutout then thru to the high pressure cut out, then it goes to the powertrain control module as an input to request the compressor to be turned on. The powertrain control module then grounds the compressor relay to turn on the compressor. there are plenty of places to have problems here. If I were workiing on this system here is what I would do. 1. I would verify proper charge of refrigerant. Very important, these systems are very sensative to low charge. 2. I would check for 12v. in and out of both high and low pressure switches. 3. I would use a scan tool and see if the powertrain control module is commanding compressor turn on. 4. Then I would jumper the compressor relay and see if the compressor comes on. Hope this helps, Ted
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