Operation CHARM
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Pontiac
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1991
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Grand AM L4-151 2.5L
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Repair and Diagnosis
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Heating and Air Conditioning
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Control Assembly
Control Assembly
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Description and Operation
Testing and Inspection
Initial Inspection and Diagnostic Overview
Component Tests and General Diagnostics
A: Rear Defogger Control Test
B: Rear Defogger Timer Relay Test
C: Rear Defogger Test
Service and Repair
With Air Conditioning
Without Air Conditioning
