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went to the dealer already and it seemed to work after they checked it out, I went on a a small road trip and it stopped working again, so I tested it out myself, shut off the car, restart it and the rear seat heater blower is on full hot, it goes to hot for 1 minute and it seems a relay goes off and it turns to full cold. I repeated the same steps 4 times with identical results. so it is off to the dealer again, I've had the car 3 weeks and this is the third trip to the dealer. I guess GMC is "Get Mechanic Constantly" or it misses the lot. Im not sure, but with buying the extened warranty these guys are going to love me, my work is next door to the dealer. went to the dealer already and it seemed to work after they checked it out, I went on a a small road trip and it stopped working again, so I tested it out myself, shut off the car, restart it and the rear seat heater blower is on full hot, it goes to hot for 1 minute and it seems a relay goes off and it turns to full cold. I repeated the same steps 4 times with identical results. so it is off to the dealer again, I've had the car 3 weeks and this is the third trip to the dealer. I guess GMC is "Get Mechanic Constantly" or it misses the lot. Im not sure, but with buying the extened warranty these guys are going to love me, my work is next door to the dealer.
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the relay is built into the speed resistor or motor control module ) depends if you have automative or manual heater controls. is automatic it will be motor control module and manual is the resistor module. these units are located beside the heate fan motor. the motor helps keeps the unit cool. just unbolt the module, unplug it and install new one. Just check to make sure the connector is good.. The heat created by the connection sometimes melts the power or ground leads (red or black) and if this is so you will need to replace the pin.
went to the dealer already and it seemed to work after they checked it out, I went on a a small road trip and it stopped working again, so I tested it out myself, shut off the car, restart it and the rear seat heater blower is on full hot, it goes to hot for 1 minute and it seems a relay goes off and it turns to full cold. I repeated the same steps 4 times with identical results. so it is off to the dealer again, I've had the car 3 weeks and this is the third trip to the dealer. I guess GMC is "Get Mechanic Constantly" or it misses the lot. Im not sure, but with buying the extened warranty these guys are going to love me, my work is next door to the dealer.
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