i started my truck and I heard a loud screeching noise while the motor runs. I popped the hood and my belt is not spinning and smoking, belt and tensioner ford oem only a few months old.... ceased pulley?
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Sounds like the siezed compressor I had done end of last summer. Ac on it screams, ac off it went quiet.
If he does commercial I'm sure he has 134a and nitrogen. I do commercial and R22, 134a and 410a are the most common refrigerants we use. Dry Nitrogen is great for helping dry the system. Replace all your components(compressor/drier/orifice tube), evacuate with your vacuum pump, sweep with nitrogen just to break the vacuum then run the vacuum again and charge.Different refrigerant on those systems but same principals. If he has a nitrogen bottle I would hit the system with that before recharging. Really dries the snot out of it. Won't have any moisture issues contaminating the r134a.