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Test H: Defrosting Insufficient

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. 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  .
  1. Start engine. Select DEFROST mode. Select maximum blower speed. If sufficient air flow from defroster outlets is present, go to next step. If there is not sufficient air 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 the minimum blower speed. Select the maximum temperature setting. Feel the temperature of the inlet and outlet hoses at the heater core. If the inlet hose feels warmer than the outlet hose, go to step  5. If the inlet hose does not feel warmer than the outlet hose, go to step  11.
  4. Repair the low engine temperature concern. If repair is complete, go to step  13.
  5. Check operation of compressor clutch. If compressor clutch engages, go to step  7. If compressor clutch does not engage, go to next step.
  6. Repair A/C compressor clutch. See TEST F: COMPRESSOR CLUTCH DOES NOT ENGAGE . If the repair is complete, go to step  13.
  7. Perform A/C performance test. See A/C SYSTEM 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. Check for correct operation of air recirculation door. If air recirculation door is operating correctly, go to step  13. If air recirculation door is not operating correctly, go to step  12.
  9. Repair air delivery concern. If repair is complete, go to step  13.
  10. Repair A/C performance concern. See SYMPTOM TESTS . If repair is complete, go to step  13.
  11. Repair heating concern. If repair is complete, go to step  13.
  12. Repair recirculation door concern. See ACTUATOR DOORS  under REMOVAL & INSTALLATION. If repair is complete, 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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