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Lots of reasons Posted by Ari [Email] ![]() ![]() In Reply to: A/C problems help please, ideas>?, Leo In Vermont, Sun, 30 Apr 2006 14:40:21 Members do not see ads below this line. - Help Keep This Site Online - Signup |
In no particular order -
-Pitted contacts on the A/C relay
-Bad ground wire from the compressor clutch.
-Bad power wire to the compressor clutch - on many cars, that's a spring-loaded single wire connector.
-Low freon pressure - usually the A/C will turn on then turn right off; it can't tell low pressure until the system runs
-Bad low pressure switch
-Bad high pressure switch
-Bad freeze sensor switch
And on and on.
If you have a schematic, get out a meter and start tracing. Make sure the compressor clutch ground is OK, and then see if it's getting power when it should be engaged. Start working backwards to the relay, and make sure the relay is getting power and the command ON signal. It's pretty straightforward - Power from the A/C relay to the clutch. The relay is turned on by either the AC switch on the dash (Manual climate control) or the ACC. Between that signal and the A/C relay coil are a bunch of switches that can disable the relay - freeze, high pressure, low pressure. A bad switch, bad connection, etc, can all do it.
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