Replaced AC compressor, worked briefly, now non-functional
The AC in my 2005 Mazda 3 stopped working 6 months ago. Finally got around to working on it: replaced the high pressure hose, then realized the compressor had seized. Just finished putting the new compressor in.
I cleaned the system with solvent and put it under -30psi vacuum for ~an hour. Then charged it up, and it worked great! For about ten minutes. Then the AC started fluctuating in temperature from room temp to cold. Then I got a burning smell and it stopped cooling.
The AC clutch is not engaging now. The low side of the ac was at 50psi when I charged it, and it's at ~150psi now (but the car is hot).
Any ideas? I'm thinking it might be a stuck expansion valve. There was a bit of metal in the oil from the old compressor.
Update: My friend posted a request over here and some mechanics have replied with a few ideas. I'm going to order a new condenser, dryer, and expansion valve next.