scotth48

What are the part numbers for a 1993 LT1 air conditioner switch and sensor? Which one controls the radiator fans, the sensor or the switch? Which one has two wires and the one with three wires? I think the pressure sensor has the 3 wires, and the pressure cycling switch has the 2 wire. Seems like I bought one several years ago of one of them and they asked me what color I needed, I think the choice was white, black and I think green colored housing. This system was changed over to r134 on the new '93 engine I bought, will the r12 sensor and switch be ok, or do I need one's for a '94 system?

WVZR-1

3 terminal pressure switch GM 22599559, cycling switch GM 52461142 for '93.

There are different thoughts about the cycling switch, changing to the earlier thru '91 which would require a different connector but is adjustable, try the '94 for fit or "SunCR" mentions most he's purchased recently whether intended for R12 or R134a were set for R134a pressures.

You mentioned the '93 engine I bought = engine has nothing to do with AC component requirements.

You asked and attempted to answer most of your questions so it's difficult to try and help. The part #'s I mentioned are '93 for sure. Cycling does just that, pressure switch does everything else and NEITHER directly control the fans. Fans are ECM controlled from information supplied by various sensors.

scotth48

Thanks for the part numbers. The engine I purchased came complete with accessories on it including A/C compressor and hoses. That is how I found out it had been switched over as the one line had the R134 fitting. This was a complete line with the fitting not an adapter on a R12 line. So I assume it must be a line from a '94 or newer C4.