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

Did you perform the Functional Check?

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Go to Step 2

Go to Function Test

1. Inspect the defroster nozzle.
2. Remove any foreign objects
3. Repair any loose instrument panel pad that blocks an outlet.

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Go to Step 3

Go to Air Outlet Duct Replacement - Right Defogger

1. Place the ignition switch in the RUN position.
2. Move the temperature control knob from extreme cold to extreme hot one step at a time.
3. Check vacuum source to defroster air valve vacuum actuator.
4. Monitor the defroster air valve vacuum actuator.

Does the shaft move when moving the knob?

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Go to Step  4

Go to Temperature Actuator Replacement

1. The problem is not electrical.
2. Ensure that the vehicle is reaching the normal operating temperature.

Is the vehicle reaching the normal operating temperature?

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Go to Step  5

Go to Engine Coolant Thermostat Replacement

Heating insufficient.

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Go to Heating Insufficient