Defrosting Insufficient
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Defrosting Insufficient
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic |
| 2 |
|
Go to Step 3 | Go to Step 10 |
| 3 | Measure the engine operating temperature. Does engine reach a normal operating temperature? |
Go to Step 10 | Go to Step 8 |
| 4 |
CAUTION:
Refer to Moving Parts and Hot Surfaces Caution
.
|
Go to Step 11 | Go to Step 5 |
| 5 | Test the operation of the A/C compressor clutch. Does the A/C compressor clutch engage? |
Go to Step 7 | Go to Step 6 |
| 6 | Repair the A/C compressor clutch. Refer to HVAC Compressor Clutch Does Not Engage
for Automatic Systems or HVAC Compressor Clutch Does Not Engage
for Manual Systems. Is the repair complete? |
Go to Step 14 | - |
| 7 | Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test (Short Wheel Base) or Air Conditioning (A/C) System Performance Test (Long Wheel Base - 1500 Series) or Air Conditioning (A/C) System Performance Test (Long Wheel Base - 2500 Series) . Is the A/C system operating within the specifications? |
Go to Step 9 | Go to Step 12 |
| 8 | Repair the low engine temperature concern. Refer to Engine Fails To Reach Normal Operating Temperature
. Is the repair complete? |
Go to Step 14 | - |
| 9 | Inspect for correct operation of the recirculation door. Is the recirculation door operating correctly? |
Go to Step 14 | Go to Step 13 |
| 10 | Repair the air delivery concern. Refer to Air Delivery Improper
for Automatic Systems or Air Delivery Improper
for Manual Systems. Is the repair complete? |
Go to Step 14 | - |
| 11 | Repair the heating concern. Refer to Heating Performance Diagnostic . Is the repair complete? |
Go to Step 14 | - |
| 12 | Repair the A/C performance concern. Refer to Air Conditioning (A/C) System Performance Test (Short Wheel Base) or Air Conditioning (A/C) System Performance Test (Long Wheel Base - 1500 Series) or Air Conditioning (A/C) System Performance Test (Long Wheel Base - 2500 Series) . Is the repair complete? |
Go to Step 14 | - |
| 13 | Repair the recirculation door concern. Refer to Air Recirculation Malfunction
for Automatic Systems or Air Recirculation Malfunction
for Manual Systems. Is the repair complete? |
Go to Step 14 | - |
| 14 | Operate the system in order to verify the repair. Did you find and correct the condition? |
System OK | Go to Step 2 |