Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2: This test resets HVAC control module and checks for current air temperature actuator DTC.
4: This checks for proper airflow for each auxiliary blower motor speed position.

Too Cold in Vehicle - Auxiliary (VIN 3)

Step	Action	Yes	No
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The auxiliary heating is insufficient.
1	Did you perform the HVAC Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - HVAC Systems - Automatic
2	Recalibrate actuators. Refer to Re-Calibrating Actuators (Primary) Re-Calibrating Actuators (Auxiliary HVAC) . With a scan tool, observe the Heating and Air Conditioning DTC List. Does DTC B0229, B0414, B0424, B3761 or B3770 set?	Go to Diagnostic Trouble Code (DTC) List	Go to Step 3
3	Turn ON the ignition, with the engine OFF. Place the blower motor switch in each speed position. Does the auxiliary blower motor operate in any of the speed positions?	Go to Step 4	Go to Blower Motor Inoperative - Auxiliary (Body Type VIN 3) Blower Motor Inoperative - Auxiliary (Body Type VIN 6)
4	Does the auxiliary blower motor operate at the desired speed?	Go to Too Cold in Vehicle	Go to Blower Motor Malfunction - Auxiliary (Body Type VIN 3) Blower Motor Malfunction - Auxiliary (Body Type VIN 6)