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I with Kappy on the relay Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Tue, 14 Sep 2004 08:42:11 In Reply to: Thanks, Kappy. Foglight Relay Behind Glovebox Too?, Peter Ingram, Tue, 14 Sep 2004 06:11:37 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The compressor relay on my 1983 900 required contact cleaning every few years or so. The compressors draw a LOT of current on startup and cycle on and off quite often, corrode during the off season. Of course they are much easier to access on a 900, and your 1993 is easier than the later models with the passenger airbag. You can try swapping with another relay of the same type or jumping across the appropriate relay slots.
To eliminate the variable of the low pressure switch, you can jump across the two wires (in a socket?) that go to the switch - a well placed paperclip works fine, don't let it touch ground. Don't do this for very long, as it's not advisable to run the compressor with no pressure in the system, which is what the switch is there for.
I don't believe that there is any electrical sensor on the expansion valve, but have never diagnosed a bad one. I think that their failure mode is clogging from debris in the system.
The other electrical switch on the AC system is the anti-icing sensor (forgot the proper name) on the evaporator, but if you can't get the AC to start up, the evaporator is not frozen.
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