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So, it probably was an R4 then? They usually don't come with an HP switch, you have to install one. Then check your air gap on the clutch, s/b 0.20" - 0.35" IIRC. I had a new NAPA compressor with a gap of >0.080" which proceeded to smoke the clutch within a week
. BTW, adjusting the air gap is fun since the nut on the shaft bottoms out before you get to the proper gap, you have to drive the clutch on further to get there. It seems the nut is just there to keep it from flying off I think this is the way to go here in Arizona. Looks like a easy way to get Rec all the time when on full cold. It should help keep me cool in a black truck. The compressor on my 90 454SS is making noise and I am going to replace it before summer. I have a one wire white switch but no way to know the pressure settings to replace it with a two wire. I can’t find any one wire switches.
I'd strongly urge you to rethink that. When it's hot (both ambient and engine) you shut off the engine, go do something, then come back in a little while, start up and turn the A/C back on, that's when it'll spike way over 500 PSI and blow something up. With the 2-wire high pressure shutoff switch it'll just cycle until pressures equalize more, then it'll run continuously. It's not a hard job to wire it in series with the low pressure cycling switch.
Nothing will. Maybe someone replaced the compressor and didn't install the HP switch? They usually don't come with one. Are there a couple wires laying around near there? They s/b connected to each other or the compressor won't run at all.
That Air Inlet Valve Pressure Switch was discontinued by GM since this was originally an R12 system which ran lower pressures than R134A. It was cheaper to just put in a timer which will automatically put it in "Recirc" after 30 seconds when A/C is on, set at coldest setting, and fan set at Med or Hi.
You'd be nuts to not replace EVERY O-ring in the system, and the accumulator/desiccant pouch at the same time.
This is an old thread brought back to life. It's been years since I worked on my A/C and it's still going strong. I did replace the receiver/dryer, orifice tube, compressor, condenser (with a parallel flow one), and whatever O-rings I disturbed. I do lose a little refrigerant so, I throw a can in at the beginning of the hot season. I bought a case of R134A last year and just opened it last Month.
