Did you review the Air Delivery/Temperature Control Circuit Description and perform the necessary inspections?

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Go to Step 2

Go to Symptoms

Verify that the defrost air is inoperative.

Does the defrost air operate normally?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Replace the heater-A/C control. Refer to HVAC Module Assembly Replacement .

Is the repair complete?

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Go to Step 4

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1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components disconnected.
3. Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Symptoms