Noise Diagnosis - Auxiliary Blower Motor
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Noise Diagnosis - Auxiliary 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 auxiliary 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
Diagnostic System Check - Vehicle
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2
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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 auxiliary blower motor through all of the speeds in order to determine where and when the noise occurs.
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Is a noise evident during auxiliary blower operation?
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Go to
Step 3
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Go to
Step 12
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3
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Inspect for excessive vibration at each auxiliary blower motor speed by feeling the auxiliary blower case.
Is excess vibration present?
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Go to
Step 5
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Go to
Step 4
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4
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Listen to the auxiliary blower motor at each blower speed.
Is the auxiliary blower motor making a squeaking or chirping noise?
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Go to
Step 10
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Go to
Step 12
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5
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Inspect the blower motor and the blower motor housing for proper installation.
Is the blower motor or the blower motor housing touching the vehicles body and causing the vibration?
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Go to
Step 9
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Go to
Step 6
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6
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2.
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Inspect the auxiliary blower motor impeller for deposits of foreign material.
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3.
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Inspect the auxiliary blower motor for deposits of foreign material.
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Did you find foreign material on the auxiliary blower motor?
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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 auxiliary 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 11
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8
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Remove the foreign material.
Is the action complete?
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Go to
Step 11
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-
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9
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Install the component so there is no contact with the vehicles body.
Is the action complete?
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Go to
Step 12
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-
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10
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Replace the auxiliary blower motor. Refer to
Auxiliary Air Conditioning Blower Motor Replacement
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Is the repair complete?
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Go to
Step 12
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-
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11
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Install the auxiliary blower motor. Refer to
Auxiliary Air Conditioning Blower Motor Replacement
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Is the action complete?
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Go to
Step 12
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-
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12
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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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