11 53 000 Removing and installing/replacing coolant thermostat (M52TU / M54 / M56)

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

Remove fan clutch with fan impeller and fan cowl. See 11 52 020 Removing and installing/replacing fan clutch (S52 / S54 / M52 / M52TU / M54 / M56)

Drain and dispose of coolant.

NOTE: The water drain plug is located on the exhaust side on cylinder 2 in the engine block.

Installation:

Replacing sealing ring on water drain plug.

Tightening torque. Refer to ENGINE - TIGHTENING TORQUES .

Vent cooling system and check for leaks.

Pull locks and disconnect water hoses.

Installation:

Refer to 17 00... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

Fig 1: Pulling Locks & Disconnecting Water Hoses

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Loosen nut (1).

Release screws on thermostat housing, remove thermostat housing.

Fig 2: Loosening Nut

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Installation:

Keep sealing faces clean and free of oil.

Fig 3: Identifying Sealing Faces

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NOTE: Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit.

Installation:

Replace seal (1).

Fig 4: Replacing Seal

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