dmeere Posted May 5 Share Posted May 5 I have an 87 2.5 2 wheel drive that I can't get the ac compressor to come on with the a/c control lever. Blower works fine and if I add 12 volts directly to the single wire that comes off the compressor, it engages. any thoughts on where I'm losing the 12 volts in the normal circuit? Link to comment Share on other sites More sharing options...
eaglescout526 Posted May 5 Share Posted May 5 Are you sure you’re losing voltage? Has the system been charged recently? The system has a pressure switch that will let the 12v through to power the relay to engage the clutch. If the system has no pressure, it won’t pass the voltage on. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 5 Share Posted May 5 Get yourself a set of AC gauges and check the low pressure side. It could be you have a bad pressure switch but verify the pressure first Link to comment Share on other sites More sharing options...
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