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Old 08-15-2016, 12:58 PM   #2
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Join Date: Jul 2005
Location: troy, Ohio
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Re: AC Relay Problem

The a/c relay is NOT commanded on would be the reason swapping doesn't help--- so when you put the a/c relay in the horn relay slot-- does horn work? Sure it does, because you have a perfectly good a/c relay that is NOT being told to come on-- Jumping the socket turns the switch on that the car's computer says to keep it off- there is a reason for the "NO a/c" command. you need to find it-- most likely reason is low refrigerant charge due to a leak-- adding refrigerant would probably allow the system to command on the compressor. But you need to find anfix the leak first.

Also, there could be pressure sensor issues, or temperature sensor issues- this is where a scan tool would be needed..
Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
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