DEFINITION: Time required to defrost the windshield is longer than normal.

Were you sent here from Symptoms or another diagnostic table?

Go to Step 2

Go to Symptoms - HVAC Systems - Automatic

1. Turn ignition to ON..
2. Select the DEFROST mode.
3. Select the maximum blower speed.

Does sufficient air flow from the defroster outlets?

Go to Step 3

Go to Step 6

1. Select the minimum blower speed.
2. Select the maximum temperature setting.

Warning: Refer to Moving Parts and Hot Surfaces Warning in the Preface section.

3. Feel the temperature of the inlet and outlet hoses at the heater core.

Does the inlet hose feel warmer than the outlet hose?

Go to Step 7

Go to Step 4

Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test .

Is the A/C system operating within the specifications?

Go to Step 5

Go to Step 8

Inspect for correct operation of the air inlet door.

Is the air inlet door operating correctly?

Go to Step 10

Go to Step 9

Repair the air delivery concern. Refer to Diagnostic Starting Point - Vehicle .

Is the repair complete?

Go to Step 10

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Repair the heating concern. Refer to Heating Performance Diagnostic .

Is the repair complete?

Go to Step 10

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Repair the A/C performance concern. Refer to Air Conditioning (A/C) System Performance Test .

Is the repair complete?

Go to Step 10

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Repair the air inlet door concern. Refer to Air Inlet Assembly Replacement .

Is the repair complete?

Go to Step 10

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Operate the system in order to verify the repair.

Did you find and correct the problem?

System OK

Go to Step 2