Does anyone know if there is a high pressure switch on the A/C system for a 1987 Dodge D100? If so, where is it located? I'm trying to troubleshoot why my A/C compressor is not getting electricity to it and I'm trying to understand how the system is wired. I can't seem to find the high pressure switch. I see that there is a low pressure switch on the expansion valve. When I hardwired the compressor, it does work. Thanks.

 

I I think the low pressure switch is right near the firewall on the passenger side, did you try jumping it? I have a factory service manual for an 87 if you haven't already figured this out message me and I'll try to look it up for you.