For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Is the heater outlet duct air too warm? | Go to Step 2 | Go to Step 5
2 |

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

3 |

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

4 | Inspect the temperature valve actuator for proper operation. Refer to Temperature Actuator Inoperative in HVAC Systems - Manual. Is the repair complete? | System OK | --
5 | Is the air temperature in the vehicle too warm? | Go to Step 6 | --
6 | Inspect for air leaking out of the HVAC module heater case. Is there air leaking out of the heater case? | Go to Step 7 | --
7 |

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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