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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1909 (Heating, Ventilation, And Air Conditioning) >> Diagnostic Information and Procedures >> Defrosting Insufficient (with HP5)

Defrosting Insufficient (with HP5)

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
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 or Symptoms - HVAC Systems - Automatic .
2
  1. Start the engine.
  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 8 
3 Measure the engine operating temperature.
Does engine reach normal operating temperature?		 Go to Step 4  Go to Step 6 
4
  1. Select the minimum blower speed.
  2. Select the warmest temperature setting.
  3. Feel the temperature of the inlet and outlet hoses at the heater core.
Does the inlet heater hose feel warmer than the outlet heater hose?		 Go to Step 11  Go to Step 5 
5 Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test (LY7)  or Air Conditioning (A/C) System Performance Test (LZ4)  or Air Conditioning (A/C) System Performance Test (LE5)  or Air Conditioning (A/C) System Performance Test (LY7 Red Line)  or Air Conditioning (A/C) System Performance Test (LAT Green Line)  or Air Conditioning (A/C) System Performance Test (HP5) .
Is the A/C system operating within the specifications?		 Go to Step 7  Go to Step 10 
6 Repair the low engine temperature concern. Refer to Engine Fails To Reach Normal Operating Temperature .
Is the repair complete?		 Go to Step 12  -
7 Inspect for correct operation of the recirculation door.
Is the recirculation door operating correctly?		 Go to Step 12  Go to Step 11 
8 Repair the air delivery concern. Refer to DTC B0228, B0413, or B3779 .
Is the repair complete?		 Go to Step 12  -
9 Repair the heating concern. Refer to Heating Performance Diagnostic .
Is the repair complete?		 Go to Step 12  -
10 Repair the A/C performance concern. Refer to Air Conditioning (A/C) System Performance Test (LY7)  or Air Conditioning (A/C) System Performance Test (LZ4)  or Air Conditioning (A/C) System Performance Test (LE5)  or Air Conditioning (A/C) System Performance Test (LY7 Red Line)  or Air Conditioning (A/C) System Performance Test (LAT Green Line)  or Air Conditioning (A/C) System Performance Test (HP5) .
Is the repair complete?		 Go to Step 12  -
11 Repair the recirculation door concern. Refer to DTC B0228, B0413, or B3779 .
Is the repair complete?		 Go to Step 12  -
12 Operate the system in order to verify the repair.
Did you find and correct the condition?		 System OK Go to Step 2 
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