Quote:
Originally Posted by JV44HeinzBar
Hi,
It's getting that time of year when the A/C might be needed. My 1990 uses R-12, but I'm thinking of switching it over to R-134a. I know there are conversion kits out there. Some are nothing more than new nipples and refrigerant, where as others, include a dryer canister and o-rings.
This will be my first time doing a conversion on a 964, or any other P-car, to be honest. What are your thoughts?
HB
PS. I just went through the 964 PET and I found the dryer/desiccator, but I don't know the location of it???
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Before I do anything, I will pressure test the system first and perform a leak test. If the system still has a little bit of R12, I would pressurize it with nitrogen to 200 psi, let it sit for a few hours and observe for any pressure drop. If there is a pressure drop, then use a leak detector. Once the leak is found, recover, open the system, flush, replace the leaky components, install conversion kit. Change the compressor oil. Then pull a vacuum, put in vacuum for one hour and observe for pressure rise, if vacuum holds, start charging.