DEFINITION: Noise originating from the blower motor.

1

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Go to Symptoms - HVAC Systems - Manual in HVAC Systems-Manual

or

Symptoms - HVAC Systems - Automatic in HVAC Systems-Automatic

1. Sit inside the vehicle.
2. Close the vehicle doors and windows.
3. Turn ON the ignition with the engine OFF.
4. Cycle the blower motor through all of the speeds in order to determine where and when the noise occurs.

Is a noise evident during blower operation?

Go to Step 3

Go to Step 9

Does the noise vary with blower speed?

Go to Step 4

Go to Step 9

Inspect for excessive vibration at each blower motor speed by feeling the blower case.

Is excessive vibration present?

Go to Step 5

Go to Step 6

Important: Inspect the blower motor impeller cavity through the access hole under the passenger compartment air filter.

Examine the blower motor cavity for deposits of foreign material.

Did you find any foreign material?

Go to Step 7

Go to Step 6

1. Remove the blower motor. Refer to Blower Motor Replacement .
2. Inspect the blower motor for the following conditions:

•	Cracked blades

•	A loose impeller retainer

•	Improper impeller alignment

Did you find any of these conditions?

Go to Step 8

Go to Step 9

Remove the foreign material.

Is the repair complete?

Go to Step 9

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Replace the blower motor. Refer to Blower Motor Replacement .

Is the replacement complete?

Go to Step 9

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Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2