Step | Action | Yes | No |
|---|---|---|---|
DEFINITION: Time required to defrost the windshield is longer than usual. | |||
1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual in HVAC Systems-Manual |
2 |
Does sufficient air flow from the defroster outlets? | Go to Step 3 | Go to Step 11 |
3 | Measure the engine operating temperature. Does engine reach normal operating temperature? | Go to Step 4 | Go to Step 9 |
4 |
Does the inlet heater hose feel warmer than the outlet heater hose? | Go to Step 12 | Go to Step 5 |
5 | Is the vehicle equipped with A/C? | Go to Step 6 | Go to Step 14 |
6 | Test the operation of the A/C compressor clutch. Does the A/C compressor clutch engage? | Go to Step 8 | Go to Step 7 |
7 | Repair the A/C compressor clutch. Refer to HVAC Compressor Clutch Does Not Engage in HVAC Systems-Manual. Is the repair complete? | Go to Step 15 | -- |
8 | 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 10 | Go to Step 13 |
9 | Repair the low engine temperature concern. Refer to Engine Fails To Reach Normal Operating Temperature in Engine Cooling. Is the repair complete? | Go to Step 15 | |
10 | Inspect for correct operation of the recirculation door. Is the recirculation door operating correctly? | Go to Step 15 | Go to Step 14 |
11 | Repair the air delivery concern. Refer to Air Delivery Improper in HVAC Systems - Manual. Is the repair complete? | Go to Step 15 | -- |
12 | Repair the heating concern. Refer to Heating Performance Diagnostic . Is the repair complete? | Go to Step 15 | -- |
13 | Repair the A/C performance concern. Refer to Air Conditioning (A/C) System Performance Test . Is the repair complete? | Go to Step 15 | -- |
14 | Repair the recirculation door concern. Refer to Air Recirculation Malfunction in HVAC Systems - Manual. Is the repair complete? | Go to Step 15 | -- |
15 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |
