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CLUTCH-A/C COMPRESSOR DESCRIPTION NOTE: Denso 10S17 A/C clutch assembly shown. The A/C compressor clutch assembly consists of a The A/C clutch bearing and pulley assembly on both OPERATION The A/C compressor clutch components provide the means to engage and disengage the A/C compressor from the A/C clutch engagement is controlled by the following: • A/C-heater mode control • A/C clutch relay • A/C pressure transducer (gasoline engines) • A/C high pressure switch (diesel engine) • A/C low pressure switch • Powertrain control module (PCM) or engine control module (ECM) (depending on application) The A/C compressor clutch components cannot be repaired and, if faulty or damaged, they must be replaced. DIAGNOSIS AND TESTING A/C COMPRESSOR CLUTCH COIL The A/C compressor clutch coil electrical circuit is controlled by the powertrain control module (PCM) or the engine PRELIMINARY CHECKS 1. If no diagnostic trouble codes (DTCs) are found in the powertrain control module (PCM) or the engine control module (ECM) (depending on engine application), go to Step 2. If any DTCs are found, repair as required. 2. If the A/C compressor clutch still will not engage, verify the refrigerant charge level (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - DIAGNOSIS AND TESTING - REFRIGERANT SYSTEM LEAKS). If the refrig- 3. On models equipped with the 3.7L gasoline engine, if the A/C compressor clutch still will not engage, disconnect the wire harness connector from the A/C pressure transducer and check for battery current at the connector with 24 - 18 CONTROLS KJ |