I noticed, by accident, that the defrost setting keeps the car comfortably cool in the summer. I mentioned this to my teenage son, who then asked, “well, what does the defroster run off of?” I told him I really didn’t know, but maybe it was the compressor for the A/C. So anyway, I tried it again …

Defroster/Cracked windshield

MikeInNH September 17, 2010, 8:56pm 8

I don’t see how…

If AC could cause a window to crack we’d be seeing thousands…if not millions of cracked windows every year. People have been running the AC directly on a HOT window for years…I know I have…