Noise Diagnosis - HVAC Module
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Noise Diagnosis - HVAC Module
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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 HVAC module.
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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
Symptoms - HVAC Systems - Automatic
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2
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2.
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Cycle through all of the following:
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Temperature control settings
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3.
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Determine the type of noise:
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Tick/click, chirp or groaning
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Is a scrape or pop noise evident when selecting modes or temperature settings?
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Go to
Step 6
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Go to
Step 3
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3
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Is a tick/click, chirping, groaning or scraping noise present, but decreases as blower motor speed is decreased?
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Go to
Step 6
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Go to
Step 4
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4
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Is an air rush/whistle noise evident in all modes but not all temperature settings?
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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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Is an air rush/whistle noise evident only in defrost or floor mode?
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Go to
Step 6
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Go to
Step 6
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6
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Remove the instrument panel (I/P) carrier. Refer to
Instrument Panel Tie Bar Replacement
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Is the action complete?
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Go to
Step 7
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-
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7
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•
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Inspect the air flow doors for proper operation.
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•
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Inspect the ducts for obstructions or foreign materials.
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Were any of these conditions found?
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Go to
Step 10
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Go to
Step 8
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8
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Inspect the mode and temperature doors and seals for warping or cracking.
Are the doors in normal condition?
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Go to
Step 11
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Go to
Step 9
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9
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Replace the appropriate door and/or seals.
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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Remove any obstructions or foreign material found.
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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Install the I/P carrier. Refer to
Instrument Panel Tie Bar 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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