Is the heater outlet duct air too warm?

Go to Step 2

Go to Step 5

1. Turn the ignition switch ON.
2. Move the temperature control from FULL COLD to FULL HOT.
3. Listen for the temperature valve operation.

Is there a temperature valve operation?

Go to Step 3

Go to Step 4

1. Verify that the valve operates properly.
2. Inspect the system for binding or a disconnected actuator.

Did you find and repair the condition?

System OK

Go to Step 4

Inspect the temperature valve actuator for proper operation. Refer to Temperature Actuator Inoperative in HVAC Systems - Manual.

Is the repair complete?

System OK

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Is the air temperature in the vehicle too warm?

Go to Step 6

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Inspect for air leaking out of the HVAC module heater case.

Is there air leaking out of the heater case?

Go to Step 7

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1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement .
2. Inspect the module for the following:

•	Bad case seals

•	Broken case

•	Valves binding

•	Valves not sealing

Did you find and repair the condition?

System OK

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