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Message: <blockquote data-quote="94GTstanger" data-source="post: 925544" data-attributes="member: 16249"><p>Ok...idk what kind of crack everyone is smoking but your car SHOULD NOT surge when you turn the heater on. Your "mix" or "defrost" controls have nothing to do with the temp of the air coming out of the vents...its controlled by the temp button in the middle. It operates a door and when set all the way to hot it closes off the cold side completely and opens very little the more youmove it to the cold side and when all the way cold is supposed to shut off the hot side completely. You should not be able to feel your car lose power when you turn anything on in your car bc the electrical systems works at milliseconds, much to fast for a person to notice. If its surging or losing power I would look/listen for vacuum leaks. I wouldn't think its an electrical prob since it doesn't do it on any other settings but it could be a short in those two positions somewhere. But it is not a normal operation!!</p></blockquote><p></p>