Operation CHARM
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Mercury
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1990
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Grand Marquis V8-351 5.8L
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Repair and Diagnosis
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Heating and Air Conditioning
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Control Module HVAC
Control Module HVAC
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Description and Operation
Testing and Inspection
Symptom I: No Blower
Symptom II: High Blower Always on In All Switch Positions
Symptom III: No Medium or Low Blower Speeds
Symptom IV: No High Blower Speed
Service and Repair
Technical Service Bulletins
