A constant air rush noise is typical of high-speed blower operation. Some systems and modes may be noisier than others.

Perform the following steps on a similar vehicle in order to determine whether the noise is typical or excessive:

1. Close the doors and the windows of the vehicle.
2. Sit in the vehicle.
3. Turn the ignition to the ON position. Do not start the engine.
4. Set the temperature for maximum cooling.
5. Run the blower on the 4 speed.
6. Cycle through all of the blower speeds, the modes and the temperature settings.
7. Determine if the noise is one of the following types of noise:

•	The noise is constant but decreases with blower speed reduction. The following noises are typical:

•

A whine

•	A tick/click

•

A flutter

•

A scrape

•	The noise occurs only at startup or is intermittent.

•	This noise may occur at cold ambients and low blower speeds.

•	Typical noises are a squeal or a screech.

•	The noise is constant at high blower speeds in certain modes, but can be eliminated at lower blower speeds in other modes.

•	Typical noises are a flutter or a rumble.

8. Complete the following steps if the noise persists:

•	Remove the blower assembly.

•	Inspect for obstructions or foreign material that may cause noise.

•	Remove any obstructions from the blower assembly.

•	If no obstructions are found, replace the blower assembly.