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

WARNING: This page is about a different car, the 2005 BMW 530i, 2005 BMW 525i, 2004 BMW 530i, and 2004 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove radiator cover. See RADIATOR COVER .
Remove fan cowl.
Drain off and top up coolant.

Illustrations show E46.

Pull locks and disconnect water hoses.

Fig 1: Disconnecting Water Hoses

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Loosen nut (1).

Release screws on thermostat housing, remove thermostat housing.

Fig 2: Removing Thermostat Housing

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Installation:

Keep sealing faces clean and free of oil.

Fig 3: Installing Thermostat Housing

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NOTE: The coolant thermostat is integrated in the coolant thermostat housing and can only be replaced as a complete unit.

Installation:

Replace gasket (1).

Fig 4: Replacing Gasket

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