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do you mean the fan only works on 4 + 5 speed. if that is the case than you need the blower motor resistor replaced. if it is a blower motor problem, than that will not cause a stall and there may be 2 problems. the only link to the heater and engin, is when defrost or a/c are turned on the engin should idle up just a bit to compensate for the added load. and that part is controled by the computer. let us know, mws919