Cutlass V6-191 3.1L VIN M SFI (1998)
Powertrain Control Module: Description and Operation
PCM Controlled Air Conditioning
Locations
Description
The air conditioning system uses a compressor with variable displacement.
The A/C compressor operation is controlled by the Powertrain Control Module (PCM) for the following reasons:
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Improves idle quality during compressor clutch engagement.
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Improves wide open throttle performance (WOT).
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Provides A/C compressor protection from operation with incorrect refrigerant pressures.
The A/C electrical system consists of the following components:
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A/C control head
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A/C refrigerant pressure switch
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A/C compressor clutch
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A/C compressor clutch relay
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PCM
