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Old 01-02-2010, 02:49 PM
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Air conditioning---Vintage Air with a R-4 compressor

Just put a serpintine system on my 59 using GM aluminum brackets.
The passenger side bracket is designed for an R-4 pancake compressor,
and I intend on getting a new one as soon as I finish getting the AC lines straightened out. I originally had a Sanden.

What should be my steps to properly get this system charged up??
New compressors are shipped without any oil in them and I am wondering
if I need to clean out the entire system and put in the necessary oil, or if just adding oil to the new compressor will be okay.

Also----on the 134 compressors, there is another switch on the back of the compressor.

Is this a hi-low switch??? and does it need to be wired in a series with the clutch??

Already have a trinary switch in the system, and if this is a hi-low switch, can it be bypassed, or should I use it??

The one I got from a junkyard---to get the hoses routing right---I cannot recall if it had an electric fan or not---was a 95 S-10 and I think those have mechanical fans. So I do not believe this is a fan switch.
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