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Remove fan clutch with fan impeller and fan cowl, refer to Fan Clutch, Service and Repair. Drain and dispose of coolant. See: Coolant/Service and Repair Note: The water drain plug is located on the exhaust side on cylinder 2 in the engine block. Installation: Replace sealing ring of water drain plug. Tightening torque, refer to Specifications, Mechanical. Vent cooling system and check for leaks, refer to Cooling System, Service and Repair. See: Coolant/Service and Repair Pull locks and disconnect water hoses. Installation: Refer to general instructions for work on cooling system, refer to Cooling System, Service and Repair. Loosen nut (1). Release screws on thermostat housing, remove thermostat housing. Installation: Keep sealing faces clean and free of oil. 2000 BMW 323i (E46) L6-2494cc 2.5L DOHC (M52 TU) Note: Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit. Installation: Replace gasket (1).

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1. Remove the right-hand bank primary timing chain. See: Right-Hand 2. Remove the VVT solenoid. 3. Remove the VVT bush carrier. 4. Install the camshaft locking tool 303-530 to the left-hand bank camshafts, aligning the shafts as necessary. 5. Loosen the exhaust camshaft sprocket bolt. 6. Loosen the intake camshaft VVT unit bolt. 7. Remove the primary chain tensioner bolts. 8. Remove the tensioner assembly. 1. Remove the tensioner. 2. Remove the tensioner back-plate. 9. Remove the chain tensioner blade. 1. Remove the tensioner blade pivot bolt. 2. Remove the tensioner blade. 10. Remove the left-hand bank timing chain. Installation 1. Install the chain tensioning tool 303-532 to the exhaust camshaft sprocket. Reposition the sprocket (and the VVT unit) for the most advantageous position for use of the tool. Remove the tool. 2. Install the primary timing chain. 1. Install the primary chain over the crankshaft sprocket and the VVT unit sprocket. There must be no slack on the drive side of the primary chain and the VVT unit must not be rotated on the camshaft.

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CONDITION SUMMARY: ELECTRONIC PARKING BRAKE (EPB) ACTUATOR DIAGNOSTICS Situation: This bulletin has been developed to act as a diagnostic aid in the course of diagnosis and repair the following customer concerns of the Electronic Parking Brake (EPB) actuator: • Electronic parking brake fails to apply effectively (the parking brake may not apply at all; or the parking brake performance may be below the required standard). • Electronic parking brake fails to release properly (brake drag). • Red brake warning lamp illuminated (constant or flashing). • Message center displays ‘Parking Brake Fault’ or ‘Cannot Apply Parking Brake’ Diagnostic Trouble Codes (DTC) C1801-00 (C1801), C1802-00 (C1802), or C1803-00 (C1803 may also be logged. Action: If a customer should express the above concern and one or more of the DTC’s are stored, follow the Diagnostic Procedure outlined below in this bulletin.

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CONDITION SUMMARY: Situation: The outlet temperature of the climate control system may not be able to be lowered from either the driver or passenger face and side vents; there may also be an extreme difference between the driver and passenger sides. This issue may be caused by a fault within the Dual Coolant Control Valve (DCCV) or the Dual Automatic Temperature Control (DATC) or an electrical circuit fault. Action: In the event of a customer concern of the above, refer to the Diagnostic Procedure outlined below to assist in determining if the fault is electrical or mechanical. DIAGNOSTIC PROCEDURE 1. Verify A/C compressor operation, refrigerant charge level, and system powers and grounds. 2. Start engine. 3. Using the Dual Automatic Temperature Control (DATC), select: ‘HIGH’ temperature x ‘HIGH’ fan speed x x ‘RECIRC’ and ‘PANEL’ modes 4. Allow vehicle to sit for five minutes. 5. Using the DATC, select: x ‘LOW’ temperature 6. Allow vehicle to sit for five minutes. 7. Using a suitable temperature gauge, record the outlet temperature from both the driver and passenger air distribution vents. Recorded temperatures should be 7qC (45qF). 8. If the recorded temperatures are within 6qC (10qF? of each other, the climate control system is operating normally and no additional diagnosis is necessary. 9. If either of the recorded temperatures are greater than 45qF or the difference between the recorded temperatures is greater than 6qC (10qF?, continue the Diagnostic Procedure. 10. Shut engine off.

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50. Install the timing chain guide. Tighten to 12 Nm . Install the crankshaft sprocket. 52. Install the chain tensioning tool 303-532 to the exhaust camshaft sprocket. Reposition the sprocket (and the VVT unit) for the most advantageous position for use of the tool. Remove the tool. 53. Install the primary timing chain. Install the primary chain over the crankshaft sprocket and the WT unit sprocket. There must be no slack on the drive side of the primary chain and the WT unit must not be rotated on the camshaft. 54. Install the timing chain tensioner blade. Tighten to 14 Nm . Install the primary chain tensioner assembly. Use a wedge 303-533 (or two if required) between the primary chain tensioner and tensioner blade, to take up the slack in the chain. Tighten to 12 Nm . 56. Tighten the exhaust camshaft sprocket securing bolt. Install the chain tensioner tool 303-532 to the sprocket holes. Apply force to the tool in an anti-clockwise direction to tension the chain on its drive side. While applying the opposing force to sprocket and chain, tighten the sprocket bolt. 57. Tighten the VVT unit bolt. While still applying the opposing force to the sprocket and chain (using 303-532), check that the wedges are still in place, tighten the VVT unit bolt. Remove the chain tensioning tool and the wedge(s). 58. Remove the camshaft setting tool. 59. Install the right-hand Variable Valve Timing (VVT) solenoid and bush carrier assembly. Install new ‘O’ ring seals. Tighten to 21 Nm . 60. Remove the crankshaft setting peg 303-645 from the crankshaft position sensor location. 61. Carry out a valve clearance check. For additional information, refer to[Valve Clearance Check]