Rod the Sound Guy

Good idea. It should take longer to freeze up at higher fan speeds, so you could try to test that theory. Thanks! Here's a new thing I discovered last night: if I leave the A/C off while I'm driving for a long period of time then suddenly turn on the A/C, it is cold. So it has nothing to do with the car being warm. Any other possibilities? Given the symptoms I've mentioned could it still be the heater valve as the original replier suggested?

Interestingly I started it up and have left it idling without driving it, and it was cold for about 45 minutes before it got warm. Hopefully that is an indicator? Also I should add that I ran the a/c diagnostic check (before and after it got warm) and it came up as 00 (no errors).

Well it's definitely not low on freon, the a/c was completely redone just before I bought the car, the seller gave me the receipt. (Unfortunately that repair shop is far away from me and never answers their phone or returns my calls.) <_< It really acts as though I turned off the a/c - not only does it suddenly go from freezing cold to tepid after 10 minutes, it gets really humid in the car as it would with the a/c off too. So is the heater valve the only thing it could be?

Hi - I have a 98 SC300. The A/C is nice and cold every time I start up the car when the car is cold, but then like clockwork, after about ten minutes, it's just as though I turned the A/C off, and will remain so until I park the car for a while . If I turn off my car and then on again this doesn't make it cold again, apparently the car has to sit until it gets cold again. Not only is it frustrating because of the heat, but it also won't defrost. Any ideas what could cause something like this?