Step

Action

Yes

No

Were you sent here from Symptoms or another diagnostic table?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic in HVAC Systems - Automatic

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 4

Go to Step 3

Is a tick/click, chirping, groaning, air rush/whistle or scraping noise present, but decreases as blower motor speed is decreased?

Go to Noise Diagnosis - Blower Motor

Go to Step 4

Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages, and Console.

Is the action complete?

Go to Step 5

--

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 6

Go to Step 7

Remove any obstructions or foreign material found.

Is the action complete?

Go to Step 11

--

Inspect the mode, temperature, and air inlet doors and seals for warping or cracking.

Are the doors in operating properly?

Go to Step 9

Go to Step 8

Replace the appropriate door and/or seals.

Is the repair complete?

Go to Step 11

--

Inspect the mode, temperature and air inlet door actuators.

Are the actuators operating properly?

Go to Step 11

Go to Step 10

Replace the appropriate actuator.

Is the action complete?

Go to Step 11

--

Install the I/P carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages, and Console.

Is the action complete?

Go to Step 12

--

Operate the system to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2