Noise Diagnosis - Blower Motor
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Noise Diagnosis - Blower Motor
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Step
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Action
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Yes
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No
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DEFINITION: Noise originating from the blower motor.
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1
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Were you sent here from Symptoms or another diagnostic table?
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Go to
Step 2
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Go to
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2
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Inspect the air inlet grille for debris.
Is debris present?
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Go to
Step 8
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Go to
Step 3
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3
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1.
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Sit inside the vehicle.
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2.
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Close the vehicle doors and windows.
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3.
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Turn ON the ignition, with the engine OFF.
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4.
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Cycle the blower motor through all of the speeds and modes in order to determine where and when the noise occurs.
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Is a noise evident during the blower operation?
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Go to
Step 4
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Go to
Step 11
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4
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Inspect for excessive vibration at each blower motor speed by feeling the blower case.
Is excess vibration present?
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Go to
Step 6
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Go to
Step 5
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5
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Listen to the blower motor at each speed.
Is the blower motor making a squeaking or chirping noise?
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Go to
Step 9
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Go to
Step 11
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6
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2.
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Inspect the blower motor impeller for deposits of foreign material.
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3.
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Inspect the blower motor for deposits of foreign material.
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Did you find any foreign material on the blower motor or blower motor impeller?
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Go to
Step 8
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Go to
Step 7
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7
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Inspect the blower motor for the following conditions:
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•
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A loose impeller retainer
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Improper impeller alignment
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Did you find any of these conditions?
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Go to
Step 9
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Go to
Step 10
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8
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Remove the foreign material.
Is the action complete?
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Go to
Step 10
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-
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9
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Replace the blower motor. Refer to
Blower Motor Replacement
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Is the repair complete?
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Go to
Step 11
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-
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10
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Install the blower motor. Refer to
Blower Motor Replacement
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Is the action complete?
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Go to
Step 11
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-
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11
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Operate the system in order to verify the repair.
Did you find and correct the condition?
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System OK
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Go to
Step 2
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