2001 Peterbilt 379 ac help please

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I checked all the prongs and they are good. I will check to see where the thermostatic switch is located.

 

system was flushed both times I repaired it. First time was just the lines themselves since I replaced all the hard parts (condenser, evaporator, ets). This time I once again did all the lines and the hard parts.

 

Yea lines were blown out, I recently read some people claim of the citrus smell just kind of being there for awhile so maybe what I purged out of the gauge lines was not the actual liquid cleaner but it did smell citrus. I just didn’t like that. I pulled 3 different vacuums for a considerable amount of time each as to boil off any residual cleaner, one I bottled up over night to check for leaks. It’s not necessarily cheaper at this point to pay a shop since all the parts have been replaced and it seems as there’s just an electrical gremlin to chase down. Only thing a shop could do better than me is to possibly re flush, vacuum, and charge it up. But for the sake of saying screw it im done with it, sure I’m about to take it to a shop.

 

The new pressure switches were installed correctly, the only one you can really mess up is on the high side you have the one on the firewall and the one near the radiator. But I got them through Peterbilt so they were verified to be the right one for the locations. I believe the hi and lo were different sizes but I’m sure I can manage to mess that up too lol.

 

That’s what I was hoping for at this point. Tomorrow im going to remove all the wire from the loom from the compressor all the way to the firewall connection and do the same for the sensor wires and hope that there’s a break or something. Once I get it to at least turn the compressor on I’m not going to actually use the compressor until I get it to a shop for a flush, new dryer and orfice tube, a proper vacuum and charge. It’s just odd it was working until the last compressor gave out and now that I’ve replaced what needed replaced it has a new issue. That’s just kinda my luck though I guess lol.

 

if not I’m he

Oh boy. Well I appreciate your help with all of this. I’ll let ya know what it was when I figure it out. If I don’t figure it out I’m going to stop by this shop on my return trip where there’s a gem of a mechanic and I’ll let ya know what he finds. It will probably be him who finds it, but I ain’t quitting until I get it to him!

 

attached is a picture of my fuse panel. Something seems to be off. The only relay that I feel click when I press the ac button on/off is the one on the bottom near the right.

I replaced the fuse you were talking about and it didn’t change anything unfortunately. I was hoping for it to be simple like that since it was working not that long ago.