Replace the compressor before if fills the system with shrapnel -- if
it's knocking, you can TRY adding oil by removing it, dumping out
what's in it, and adding the correct amount (128 mL if i remember
correctly, but check first). Use only PAG oil with that system, the
compressor does NOT like ester oils unless it's also full of
hydrocarbon oil.
I would flush as well as possible, too. 1:1 mixture of dry methanol
and hexane, or buy the stuff at the auto parts store. Tons of black
crap will come out of the condenser, which is good. If there is any
"aluminum paint" in there, install a filter in the suction hose or
the next compressor will die really fast.
Replace all the 0-rings while you are at it and yank the rad -- there
will be a huge collection of dead bugs and crap between the condenser
and radiator that needs to go. If not, you will have poor
performance at idle.
Peter
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