Yesterday I was driving mothers W126 (she had picked me up, one of my cars was at the shop). The A/C was working (not ice cold, but was pretty good) when we first left.. stopped at the bank and made a deposit (shut off the A/C and car while in line, it was moving very slowly), but when we took off again, the A/C was not cooling. Blower is still fine, but only putting out heat. The compressor is not kicking on - I cant hear it kicking on anyway. Could the refrigerant have leaked out that quickly, or the compressor locked up, or? Just trying to figure out what the most likely cause would be. Thanks.
btw, its a '88 300SEL.