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Buick
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1999
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Riviera 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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Reading and Clearing Diagnostic Trouble Codes
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Clearing Trouble Codes - HVAC System - Automatic
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Without Scan Tool
Without Scan Tool
A drive cycle occurs when you turn ON the ignition. If no diagnostic trouble code occurs for 50 drive cycles, any existing history DTCs will clear from the memory of the
heater and A/C programmer
.