I just had a quick question concerning this air conditioning thing. I have a 1998 Blazer, and live in central Florida, where it has been hitting 100 degrees a few days out of the week. I never drive with my air conditioner on because I am afraid it is bad for my car and will cause it to get too hot. Does this make any sense? Is it bad to run a vehicles air conditioning? I just don't like putting too much stress on my engine. Also, how long is too long to let a vehicle idle say in a parking spot waiting for someone with the air? I baby my truck, possibly too much, and just wanted to know how irrational I am being. Thanks.