LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (HVAC Systems - Manual) >> Symptom Tests >> Defrosting Insufficient

Defrosting Insufficient

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .
NOTE: Definition: Time required to defrost the windshield is longer than normal.
  1. Were you sent here from SYMPTOM DIAGNOSIS  or another diagnostic table? If so, go to next step. If not, see TROUBLE SHOOTING .
  2. Start the engine. Select the DEFROST mode. Select the maximum blower speed. Does sufficient air flow from the defroster outlets? If so, go to next step. If not, go to step  10.
  3. Measure the engine operating temperature. Does engine reach a normal operating temperature? If so, go to next step. If not, go to step  8.
  4. Select the minimum blower speed. Select the maximum temperature setting. Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet hose feel warmer than the outlet hose? If so, go to step  11. If not, go to next step.
  5. Check the operation of the A/C compressor clutch. Does the A/C compressor clutch engage? If so, go to step  7. If not, go to next step.
  6. Repair the A/C compressor clutch circuit. After repairs are completed, go to step  14.
  7. Perform the A/C system performance test. See A/C PERFORMANCE TEST  under PERFORMANCE TESTS. Is the A/C system operating as specified? If so, go to step  9. If not, go to step  12.
  8. Repair the low engine temperature concern. After repairs to cooling system, go to step  14.
  9. Inspect for correct operation of the recirculation door. Is the recirculation door operating correctly? If so, go to step  14. If not, go to step  13.
  10. Repair the air delivery concern. See IMPROPER AIR DELIVERY . Is the repair complete? If so, go to step  14.
  11. Repair the heating concern. See HEATER PERFORMANCE TEST  in PERFORMANCE TESTS. After repairs are completed, go to step  14.
  12. Repair the A/C performance concern. See A/C PERFORMANCE TEST  in PERFORMANCE TESTS. After repairs are completed, go to step  14.
  13. Repair the recirculation door concern. After repairs are completed, go to step  14.
  14. Operate the system in order to verify the repair. If system operates normally, repair is complete. If system still malfunctions, return to step  2.
scientia non olet · About LEMON Manuals