Operation CHARM
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Oldsmobile
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1998
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Cutlass V6-191 3.1L VIN M SFI
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Repair and Diagnosis
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Heating and Air Conditioning
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Air Door
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Description and Operation
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Defrost Valve
Defrost Valve
The defrost valve directs the air mix to the windshield based on input from the mode switch. The defrost valve is vacuum actuated.