I'm working through a series of electrical issues with this truck, none of which have (so far) been major. I'm hoping that someone can give me some guidance on the AC not working.

The blower runs on all three speeds, I can adjust the heat to warmer of cooler, and the floor, dash and defrost modes seem to work fine. The problem is that I don't have any lights on either the AC or Recirculation switches on the climate control module. I had lights at one time, but the compressor hasn't run since I've owned the truck.

I'm not educated on how the AC should work on this truck, what the power flow is to activate the compressor, or what the common problems with the AC are. Any help to troubleshoot this and get the AC working as it should would be much appreciated!

 

Probably the reason the compressor wont run is that the refrigerant is low. On the accumulator on the passenger side firewall, there is the low pressure switch...If the refrigerant is low, the switch wont allow the power to get to the compressor. A quick test is to unplug the connector at that switch and bypass the 2 terminals in the connector. The compressor should then kick in. If not you have other problems. If it does kick in, you need to check the system for leaks and recharge it