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Best Quality Reproduction Resistor For Cars Without Air Conditioning Correct Resistance For Blower Motor Having trouble getting hot air out of yourfull size Chevysheater system other than on high speed? Most likely your blower motor resistor has gone bad. This little fiberglass board uses a series of progressive resistors to regulate the motors speed throughout the switch range. The highest speed of the heater blower motor is not controlled by the resistor; so when the resistor fails, the fan will often work on the highest speed setting and not the lower speeds. Don't put up with a cab that's to hot or to cold. After all, you're not Goldilocks.Late Great Chevyknows that sometimes just a little heat does the job. Trust the experts not only to get yourclassicfull size Chevyrunning right; but, make it comfortable to be in.