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Test G: Defrosting Insufficient

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine. Select DEFROST mode. Select maximum blower speed. If sufficient air flows from the defroster outlets, go to next step. If air flow is not sufficient, go to step  9.
  2. Measure engine operating temperature. If engine operating temperature is within specifications, go to next step. If engine operating temperature is not within specifications, go to step  4.
  3. Place blower control switch at minimum speed. Place temperature control at maximum position. 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. Diagnose and repair low engine temperature condition. When repair is complete, go to step  13.
  5. Check 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. Diagnose and repair A/C clutch condition. See TEST F: COMPRESSOR CLUTCH DOES NOT ENGAGE . Repair as necessary. When repairs are complete, go to step  13.
  7. Perform A/C System Performance test. See A/C SYSTEM PERFORMANCE  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. Ensure 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. Diagnose and repair air delivery condition. See TEST A: AIR DELIVERY IMPROPER  under SYMPTOM TESTS. When repairs are complete, go to step  13.
  10. Diagnose and repair A/C performance condition. See A/C SYSTEM PERFORMANCE  under PERFORMANCE TESTS. When repairs are complete, go to step  13.
  11. Diagnose and repair heating system performance condition. See HEATING SYSTEM PERFORMANCE  under PERFORMANCE TESTS. When repairs are complete, go to step  13.
  12. Make necessary repairs to recirculation door. When repairs are complete, go to next step.
  13. Operate system to verify repair. If condition is corrected, system is okay. If condition is not corrected, go to step  1.
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