[BlazerBoyLT98]

First off, I did not call you a retard, I asked you to look into what you are talking about before you call something retarded. The question here is why his light blink and does not stay on. If you try to use your A/C by pushing the A/C button on any other option then vent, floor and vent, or floor, the button will blink and the A/C will not come on. Yes the defrost uses the evaporator, but when you run the defrost it does not have to blow cold air, do you use the cold setting in the middle of the winter to defrost the windsheild? I think not. Anyway, as I said, if you have the push button A/C in your blazer it will only work with the vent, floor, or floor and vent, other then that you will not get the A/C button to stay lit, I have tried it and it does not work. And once again, if youc ould read you would see I did not call you retarded, I asked you to do some research before you called something retarded.