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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 641 (Heating, Ventilation, And Air Conditioning) >> Diagnostic Information and Procedures >> Noise Diagnosis - HVAC Module

Noise Diagnosis - HVAC Module

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Noise Diagnosis - 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 - Manual
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 Noise Diagnosis - Blower Motor  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 Remove the center air outlet duct. Air Outlet Duct Replacement - Center .
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 10  Go to Step 9 
9 Replace the appropriate door and/or seals.
Is the repair complete?		 Go to Step 10  -
10 Remove any obstructions or foreign material found.
Install any components that were removed.
Is the action complete?		 Go to Step 11  -
11
  1. Install the center air outlet duct.
  2. Install the instrument panel (I/P) center trim panel. Refer to Instrument Panel Center Trim Panel 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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