Quote:
Originally Posted by cbjukraine
Rich, I have a nitrogen cylinder right now with about 1500 psi still in it. Got the regulator too. Do you think it would be wise to go buy a small bottle of r134 and shoot a little in there? I could pick up the cheap Harbor Freight sniffer and check that way. I've tried the soapy water test with no results.
I intend to use R12 eventually, so I don't really want to re-flush the system if the R134 will contaminate the R12 mineral oil.
The last time the compressor (R4) was on the car a few days ago, I pressurized to 200 psi and it leaked down to 160 psi overnight. Not sure if that qualifies as a slow leak, but it seems like a big one to me.
The back story here is that the A/C was working great (33-34* vent temps in high 90s weather) in Summer 2012 by installing a new Compressorworks R4, flushing, and charging with R12/Mineral oil. But then I had to put the car in storage for 15 months, and when I came back to get it, the R12 was all gone.
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I am not sure about contaminating the oil, but you would not want to mix refrigerant if you are going to recycle (recover) it. If you want to use a sniffer for testing, use R22 as suggested previously (venting is allowed by law). You don't want to use R12, as it will be wasted. If you had dye in the system previously and have an evaporator leak, you should be able to see evidence of it in the condensate drain, or on the trans.