AC Stopped Working

[TomB985]

This doesn’t make sense… If it was just a failed switch, jumping it to engage the compressor would give you cool air. If the system isn’t functioning with the compressor turning, the switch can’t be your problem.

 

[WhiteFalcon]

It is cooling now when I jump the switch. (Sorry I forgot to mention that part). This is why I’m starting to wonder if some rust or gunk somehow obstructed the expansion valve and messed up the pressures. That would throw the high pressure side way up I would think. The fluid from the condenser would have no place to go if the expansion valve clogged.

 

[1955moose]

Along with the switch replacement, and sucking all the junk out, put a new receiver drier. That's your air cleaner for AC. When we sold new or remanned compressors back in the day, we always recommended it as well. Mechanics knew, parts changers had to be schooled. Question comes to mind, why is it so dirty in there? Do you know the history of the AC unit? We're any major parts changed?

Sent from my N9131 using Tapatalk

 

[WhiteFalcon]

Thank you for the tip on the dryer. I will change it out. I bought the truck in 2016 so I don't know its history prior to that point. So it is always possible that the system has had leaks in the past or parts changed without a complete vacuum down. That would leave moisture for in there for sure. I also live in a marshy coastal area (ie salt water swamp without trees). Moist salt air is murder on home ac systems (corrosion and leaks), and I'm guessing that it is the same for automotive ac systems.