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front cover of the compressor. Be certain that the (6) If the original clutch plate and clutch pulley are to be reused, reinstall the original shim(s) on the (7) Install the clutch plate onto the compressor shaft. (8) Install and tighten the compressor shaft bolt. If necessary, a band-type oil filter wrench or a strap NOTE: The shims may compress after tightening (9) If a new clutch plate and/or clutch pulley are being installed, the air gap between the clutch plate (10) Install the retainer that secures the compres- sor clutch coil lead to the top of the compressor. (11) Reconnect the engine wire harness connector to the clutch coil lead on the top of the compressor. (12) Reinstall the serpentine accessory drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE (13) Reconnect the battery negative cable. being installed, the new clutch components must be A / C COMPRESSOR CLUTCH DIAGNOSIS AND TESTING A / C COMPRESSOR CLUTCH COIL The air conditioning compressor clutch coil electri- cal circuit is controlled by the ATC control module t scan tool. PRELIMINARY CHECKS (1) If no diagnostic trouble codes (DTCs) are found in the A/C-heater control or the powertrain control (2) If the A/C compressor clutch still will not engage, verify the refrigerant charge level (Refer to TESTS (1) Verify the battery state of charge (Refer to 8 - ELECTRICAL/BATTERY SYSTEM/BATTERY - DIAGNOSIS AND TESTING). (2) Connect an ammeter (0 to 10 ampere scale selected) in series with the clutch coil feed terminal. (3) With the A/C-heater control in the A/C mode and the blower motor at low speed, start the engine (4) The A/C compressor clutch should engage immediately, and the clutch coil supply voltage (5) For the acceptable A/C clutch coil current draw specifications refer to 24 - HEATING & AIR CONDI- (a) If the A/C clutch coil current reading is zero, the coil is open and must be replaced. (b) If the A/C clutch coil current reading is above specifications, the coil is shorted and must be A / C HEATER CONTROL DESCRIPTION This ATC system uses a combination of electrical and mechanical controls. These controls provide the The A/C-heater control is located on the instrument panel inboard of the steering column and below the 24 - 12 CONTROLS-FRONT VA |