Some of the recent A/C messages convinced me to ask about this. I just bought my 1990 Wagon, and am engaged in fixing up the loose ends. Pretty sure there has been no conversion work to the A/C unit. The A/C compressor works, but rumbles pretty loud when engaged. The A/C is not really as cold as it should be in my opinion, but have no temp. data to prove that (have owned 240's prior to this.) There is an oil film on the outside surface of the compressor, gritty so its not new, but the compressor is not dripping or leaking oily fluid that I can see. Finally, when I check the sight glass on the air dryer, the fluid is a consistent milky brown, just like coffee with cream or muddy water - no discernable "oily streaks" (that the manual said to watch for). The fluid flows when the A/C is on, and stops when shut off, with no perceptible "bubbles" (that the manual said to watch for). So, do I have a problem? Shouldn't the refrigerant be clear - suppose I need a recharge? Thanks!