1984 K10 AC Troubleshooting
 

I bought the truck in winter so I didn't think to test AC. It does not blow cold so I jumped the low pressure switch and the compressor came on. I noticed that it already had the R-134 adapter on so I bought a 20oz can of ACPro to put in it. About half a can in and compressor kicked on the right back off and will continue to do that until you turn AC off. Does this mean I need more 134 in it? The pressure would rise from around 25-30 up to 50 or 60 and compressor would kick on and bring it down then stop. Any advice would be very much appreciated.
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Re: 1984 K10 AC Troubleshooting
 

yes you need more 134/ freon, but you most likely have a leak. Charge and then leak test with either a leak detector, or use a uv light and dye.