Operation CHARM
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Pontiac
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1998
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Grand Prix V6-3.8L SC VIN 1
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Repair and Diagnosis
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Heating and Air Conditioning
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Testing and Inspection
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Component Tests and General Diagnostics
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System Diagnosis
System Diagnosis
Diagnosis for the temperature control portion of this system is based on malfunction codes stored in the heater-A/C control. When a code has been set, the man symbol on the RH side of the heater-A/C control display will flash.