Operation CHARM
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Pontiac
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1994
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J2000/Sunbird L4-121 2.0L
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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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Circuit Operation
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General Information
General Information
The air valves and vents in the air conditioning system are operated by mechanical and vacuum controls. There are no electrical circuits. The functions of the plenum valves and A/C Evaporator Core are described below.