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Test H: Defrosting Insufficient

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For correct circuit identification and connector terminal locations, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS .
  1. Start engine. Select DEFROST mode. Select maximum blower speed. If sufficient air flows from defroster outlets, go to next step. If sufficient air does not flow from defroster outlets, go to step  9.
  2. Measure engine operating temperature. If engine reaches a normal operating temperature, go to next step. If engine does not reach a normal operating temperature, go to step  4.
  3. Select minimum blower speed. Select maximum temperature setting. Feel temperature of inlet and outlet hoses at heater core. If inlet hose feels warmer than outlet hose, go to step  5. If inlet hose does not feel warmer than outlet hose, go to step  11.
  4. Repair low engine temperature concern. After repairs are complete, go to step  13.
  5. Test A/C compressor clutch operation. If A/C compressor clutch engages, go to step  7. If A/C compressor clutch does not engage, go to next step.
  6. Repair A/C compressor clutch. See TEST G: COMPRESSOR CLUTCH DOES NOT ENGAGE . After repairs are complete, go to step  13.
  7. Perform A/C PERFORMANCE TEST. See A/C PERFORMANCE TEST  under PERFORMANCE TESTS. If A/C system is operating within specifications, go to next step. If A/C system is not operating within specifications, go to step  10.
  8. Inspect for correct operation of recirculation door. If recirculation door is operating correctly, go to step  13. If recirculation door is not operating correctly, go to step  12.
  9. Repair air delivery concern. See TEST A: AIR DELIVERY IMPROPER . After repairs are complete, go to step  13.
  10. Repair A/C performance concern. See SYMPTOM TEST INDEX  table. After repairs are complete, go to step  13.
  11. Repair heating concern. See HEATING PERFORMANCE DIAGNOSTIC  under PERFORMANCE TESTS. After repairs are complete, go to step  13.
  12. Repair recirculation door concern. See TEST B: AIR RECIRCULATION MALFUNCTION . After repair, go to next step.
  13. Operate system to verify repair. If system operates properly, system is okay. If system does not operate properly, go to step  1.
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