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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1772 (Heating, Ventilation And Air Conditioning) >> Diagnostic Information and Procedures >> Defrosting Insufficient

Defrosting Insufficient

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Defrosting Insufficient

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
  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 11 
3 Measure the engine operating temperature.
Does engine reach normal operating temperature?		 Go to Step 4  Go to Step 9 
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 12  Go to Step 5 
5 Is the vehicle equipped with air conditioning? 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 
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