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Defrosting Insufficient

Defrosting Insufficient


Step Action Yes No
DEFINITION: Time required to defrost the windshield is longer than normal.
1
Were you sent here from Symptoms or another diagnostic table? Go to Step 2 Go to Symptoms - HVAC Systems - Automatic
2

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
3

1. Select the minimum blower speed.

2. Select the maximum temperature setting.

3. Refer to Moving Parts and Hot Surfaces Warning .

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
4
Perform the A/C system performance test. Refer to A/C system performance test . Is the A/C system operating within the specifications? Go to Step 5 Go to Step 8
5
Inspect for correct operation of the air inlet door. Is the air inlet door operating correctly? Go to Step 10 Go to Step 9
6
Repair the air delivery concern. Refer to Diagnostic Starting Point - Vehicle . Is the repair complete? Go to Step 10 -
7
Repair the heating concern. Refer to Heating Performance Diagnostic . Is the repair complete? Go to Step 10 -
8
Repair the A/C performance concern. Refer to Air Conditioning (A/C) System Performance Test . Is the repair complete? Go to Step 10 -
9
Repair the air inlet door concern. Refer to Air Inlet Housing Replacement . Is the repair complete? Go to Step 10 -
10
Operate the system in order to verify the repair. Did you find and correct the problem? System OK Go to Step 2