When the A/C is running it is that much more heat for the cooling fans to have to dissapate so it is harder on the cooling system. Check all the usual suspects. For instance: Make sure BOTH fans are running Make sure they are both running in the correct direction ie, toward the rear Make sure the fans are tight on the motor shafts and not slipping Check that there aren't any leaves or debris blocking the condensor core or radiator Bleed the cooling system at the radiator (loosen the small hose at the top right side). Make sure the intake grills are clear (don't stick the license plate over one of them, it makes a big difference) You might need a new otterstadt switch (one that turns on a little sooner). When you run the A/C it overrides the otterstadt switch. You could also check the drive belts, if they are too loose they could be slipping. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, Andrew <aos+yahoo@xxxx> wrote: > Hi group. I've recently developed a sporadic overheating problem. It may > have been around longer, but since it appears to be related to the only > recently fixed air conditioning, it's only recently popped up. > > Most of the time, I'm just fine. If the AC is off, my temperature gauge