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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cbjukraine
'84 300D