I purchased a Denso 471-0316 compressor it states the compressor is filled with a complete charge of refrigerant . It instructs to drain the compressor and only put in what my old compressor had in it when replacing just the compressor. You mean complete charge of oil. Aug. 2005, I replaced the com...

$5 a can for R134a at local Walmart.

Can you seal the leak with a new, high-quality cap? If that takes care of it, that's what I'd do first.

Where do you park this? It's been 110F or more in the shade for over 10 days, so hot like 130F in a closed garage and hotter than 110F under a carport. That's awfully hot.

No the dye was just strait dye Good: only straight dye and R134a. Your truck is a 2000; compressor seals are designed to leak a tiny amount of refrigerant & oil to lubricate the seal. Perhaps over 16 years your 2000 finally got to a refrigerant level low enough to be detected in the heat wave; ...

If the system was low, then you have a leak. It will not heal. Two weeks ago in Phoenix is was less hot (can't say "cooler"). If system was truly 100% 2 weeks ago and went to bad, then there's a larger leak recently. I hope the can of R134a/UV dye that you added did NOT contain any sealer ...

I'm not an expert like GM Tech - unless living in Arizona heat qualifies one automatically - but I agree that it sounds quite low on refrigerant. Pressures and "Started the truck and the compressor would just turn itself on and off every few seconds" are HUGE clues. I agree: have a REAL AC...

HECAT wrote:Cabin air filter clogged?

Or blower wheel loose on blower motor shaft

Or evaporator leak mixing leaked oil and dust clogging the airflow, or leaves debris having gotten sucked up onto the evaporator

Or diverter "doors" diverting air under dash, or to windshield instead

I'd also keep with R-12. What went wrong, like why are condenser and evaporator needed, did a compressor seize and contaminate the system??

Tim wrote:I got nothing. Could not even find it in Mitchell.

Thanks for checking, and I checked my used parts boxes for him. I turned out that I had 3 spare AC relays, and 2 partial harnesses.

The guy I know was able to find such relay and full harness from a parts yard, so he didn't need mine.