GMC 88892974 Motor Asm,Auxiliary Blower

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To troubleshoot a faulty HVAC system, start by checking the fuse and all connections in the circuit for looseness and corrosion. Ensure that the battery is fully charged. With the transmission in Park and the parking brake securely set, turn the ignition switch to the Run position. Remove the heater/air conditioning assembly cover and the glove box to access the blower motor. Back probe the blower motor electrical connector with a voltmeter and move the blower switch through each position, noting the voltage readings. Changes in voltage indicate varying motor speeds. If there is voltage present but the blower motor does not operate, it is likely faulty. Disconnect the blower motor connector and test it by connecting one side of the terminals to a chassis ground and the other to a fused source of battery voltage. If the blower still does not operate, check the blower motor ground wire for continuity to the ground against the chassis metal. If no continuity exists, repair the ground circuit. If the blower still does not operate properly, the resistor, control panel, or related wiring may be faulty.

To remove the auxiliary blower motor, begin by discharging the air conditioning system and draining the cooling system.