So i replaced the accumulator, the compressor with brand new not rebuilt one, new lines, LP switch and orifice tube around 4 summers ago. Worked fine every year till this one.
First issue my mechanic found the refrigerant leaked out of the high pressure fitting so we replaced with new high and low pressure fittings, vacuumed and charged the system. After that I have been having issues where it will run ice cold for an hour or so then it will blow hot air. Sometimes after awhile cool, not cold air will trickle out. The problem is made worse by shutting off and restarting the car. Sometimes it will be working fine but after I shutoff the car and restart again it starts blowing hot air.
At first my mechanic said he thought the low pressure switch was the issue so I swapped it twice, no change.
The system is charged and not losing refrigerant. The other day I stopped by my mechanic when it was blowing cool, not cold and he checked voltage at the compressor plug and it was 10 volts. he says its too low. Should be no less than 12. So now I'm wondering if theres a relay between the low pressure switch and the compressor? I've read theres a WOT cutoff that cuts power the the compressor at WOT. I cant find it if an 84 has one. Could that be the issue and whee can I find it? Whats it look like?
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