I need ac wiring diagram for 2005 peterbilt 379
Sometimes it's the sensors on the lines under the hood. Just unplug each one and use a paperclip to jump it. Do one at a time and if you fine one where the AC compressor kicks in than all you have to do is change that one.
Pull the fuse box off of the piller and look behind it there is corrosion o the relays I bet . FYI
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