Quote:
Originally Posted by hatzie
The condenser on these pickups is MASSIVE.
You can get away with R134a using the stock 1980's Harrison R4 radial compressor on these rigs. The old 1970's Harrison A6 will literally freeze you out of the cab on Max AC using R134a.
Make sure you flush out the old mineral or PAG or whatever oil from inside all of the hard parts. Mineral oil is not compatible with R134a so it won't properly travel around the system like Ester refrigerant oil and it'll insulate the inside of the evaporator and condenser. PAG and Ester oil is compatible with R134a but you don't know how much of it there is and how much water it's picked up. Get rid of all of it.
Dump the unknown pedigree oil charge that comes in your compressor and re-fill with your choice of oil. It's likely loaded with humidity and even a hard vac won't boil that much water out. The other benefit is the whole system oil charge comes from a known pedigree source and you know exactly how much oil is in there.
Be very careful to only use just enough oil. Too much oil will insulate the system just like extra mineral oil from the old R12 charge.
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Great info here. Thank you very much. It'll be nice to have air conditioning AND a 6.0 in this sucker.