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Noise Diagnosis - HVAC Module

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
NOISE DIAGNOSIS PROCEDURE TABLE - HVAC MODULE

Step Action Yes No
DEFINITION: Noise originating from the HVAC module.
1 Were you sent here from Symptoms or another diagnostic table? Go to Step 2 Go to SYMPTOMS - HVAC SYSTEMS - AUTOMATIC 
2
  1. Start the engine.
  2. Cycle through all of the following:
    • Blower motor speeds
    • HVAC modes
    • Temperature control settings
  3. Determine the type of noise:
    • Scrape, pop
    • Tick/click, chirp or groaning
    • Air rush/whistle

Is a scrape or pop noise evident when selecting modes or temperature settings?		 Go to Step 6 Go to Step 3
3 Is a tick/click, chirping, groaning or scraping noise present, but decreases as blower motor speed is decreased? Go to Step 6 Go to Step 4
4 Is an air rush/whistle noise evident in all modes but not all temperature settings? Go to Step 6 Go to Step 5
5 Is an air rush/whistle noise evident only in defrost or floor mode? Go to Step 6 Go to Step 6
6
  1. Remove the instrument panel accessory trim plate. Refer to INSTRUMENT PANEL ACCESSORY TRIM PLATE REPLACEMENT .
  2. Remove the center air outlet duct.

Is the action complete?		 Go to Step 7 -
7
  1. Inspect the air flow doors for proper operation.
  2. Inspect the ducts for obstructions or foreign materials.

Were any of these conditions found?		 Go to Step 10 Go to Step 8
8 Inspect the mode and temperature doors and seals for warping or cracking.
Are the doors in normal condition?		 Go to Step 11 Go to Step 9
9 Replace the appropriate door and/or seals.
Is the repair complete?		 Go to Step 11 -
10 Remove any obstructions or foreign material found.
Is the action complete?		 Go to Step 11 -
11
  1. Install the center air outlet duct.
  2. Install the I/P accessory trim plate. Refer to INSTRUMENT PANEL ACCESSORY TRIM PLATE REPLACEMENT .

Is the action complete?		 Go to Step 12 -
12 Operate the system to verify the repair.
Did you find and correct the condition?		 System OK Go to Step 2
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