Definition: A constant rush of air is typical of high-speed blower operation. Some systems and modes are noisier than others. Check another similar vehicle, if possible, to determine whether the noise is typical or excessive.

1. Sit in the vehicle.
2. Close the doors and the windows.
3. Turn ON the ignition.
4. Set the blower speed to HIGH and the temperature to COLD.
5. Cycle through the blower speeds, modes, and temperature settings in order to find the noise.

Is the blower noise constant at high blower speeds or certain modes but can be decreased or eliminated at lower speeds or in other modes?

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Go to Step 2

Go to Step 4

1. Remove the blower motor assembly and check for obstructions or foreign material that may be causing the noise. Refer to Blower Motor and Fan Replacement .
2. Remove any obstructing materials from the blower assembly.

Is the noise still present?

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Go to Step 3

System OK

Replace the blower motor assembly. Refer to Blower Motor and Fan Replacement

Is the repair complete?

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System OK

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Is the noise a squeal or a screech that occurs intermittently or at startup when the outside air temperature is cold and the blower speed is low?

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Go to Step 2

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