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Noise Diagnosis - Auxiliary Blower Motor

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.
Noise Diagnosis - Auxiliary Blower Motor

Step Action Yes No
DEFINITION: Noise originating from the auxiliary blower motor.
1 Were you sent here from the HVAC Symptoms? Go to Step 2  Go to SYMPTOMS - HVAC SYSTEMS - MANUAL or DIAGNOSTIC SYSTEM CHECK - HVAC SYSTEMS - AUTO
2
  1. Sit inside the vehicle.
  2. Close the vehicle doors and windows.
  3. Turn ON the ignition, with the engine OFF.
  4. Cycle the auxiliary blower motor through all of the speeds and modes in order to determine where and when the noise occurs.
Is a noise evident during auxiliary blower operation?		 Go to Step 3  Go to Step 10 
3 Inspect for excessive vibration at each auxiliary blower motor speed by feeling the auxiliary blower case.
Is excess vibration present?		 Go to Step 5  Go to Step 4 
4 Listen to the auxiliary blower motor at each blower speed.
Is the auxiliary blower motor making a squeaking or chirping noise?		 Go to Step 8  Go to Step 10 
5
  1. Remove the auxiliary blower motor. Refer to Blower Motor Replacement - Auxiliary (Body VIN Type 3) Blower Motor Replacement - Auxiliary (Body VIN Type 6) .
  2. Inspect the auxiliary blower motor for deposits of foreign material.
Did you find foreign material on the auxiliary blower motor?		 Go to Step 7  Go to Step 6 
6 Inspect the auxiliary blower motor for the following conditions:
  1. Cracked blades
  2. A loose impeller retainer
  3. Improper impeller alignment

Did you find any of these conditions?		 Go to Step 8  Go to Step 9 
7 Remove the foreign material.
Is the action complete?		 Go to Step 9  -
8 Replace the auxiliary blower motor. Refer to Blower Motor Replacement - Auxiliary (Body VIN Type 3) Blower Motor Replacement - Auxiliary (Body VIN Type 6) .
Is the action complete?		 Go to Step 10  -
9 Install the auxiliary blower motor. Refer to Blower Motor Replacement - Auxiliary (Body VIN Type 3) Blower Motor Replacement - Auxiliary (Body VIN Type 6) .
Is the action complete?		 Go to Step 10  -
10 Operate the system in order to verify the repair.
Does the system operate correctly?		 System OK Go to Step 2 
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