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The AC compressor is belt driven. There is an electric clutch that engages the belt drive to the compressor. The circuit for the clutch is driven by the Powertrain Control Module (PCM), which might feed to a relay used to drive the clutch. The PCM receives a start signal from the dashboard control knob or switch. There may also be a refrigerant pressure sensor that can moderate the output of the PCM to the AC clutch signal.

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2007-05-30 16:22:59
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Q: What do you check if no power on ac comp?
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