For 1990-2009 cars

Step | Action | Yes | No
DEFINITION: Noise originating from the HVAC module assembly.
1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to Diagnostic System Check - Vehicle.
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 | Remove the I/P carrier. Refer to Instrument Panel Retainer Replacement.

1. Inspect the air flow doors for correct operation.
2. Inspect the ducts for obstructions or foreign materials.

Were any of these conditions found?

Go to Step 9

Go to Step 7

7 | 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 8
8 | Replace the appropriate door and/or seals. Is the repair complete? | Go to Step 10 | --
9 | Remove any obstructions or foreign material found. Is the action complete? | Go to Step 10 | --
10 | Install the I/P carrier. Refer to Instrument Panel Retainer Replacement. Is the action complete? | Go to Step 11 | --
11 | Operate the system to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2