11 53 000 Removing And Installing/Replacing Coolant Thermostat (S54)

Remove fan clutch with fan impeller and fan cowl. Refer to 11 52 020 REMOVING AND INSTALLING/REPLACING FAN CLUTCH (S52 / S54 / M52 / M52TU / M54 / M56)  and 17 11 031 REPLACING FAN COWL (S54) .

Remove coolant drain plug in engine block. Drain and dispose of coolant. See 17 11 509 FLUSHING RADIATOR

Installation: 

Replace sealing ring on drain plug.

Tightening torque, refer to 11 11 5AZ in ENGINE - TIGHTENING TORQUES .

Vent cooling system and check for leaks. Refer to 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (S54) .

Remove intake filter housing with air-mass flow sensor. Refer to 13 71 000 REMOVING AND INSTALLING INTAKE FILTER HOUSING (S54) .

Fig 1: Locating Water Hoses

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Remove water hoses.

Open cable clamp (1).

Release screws on thermostat housing. Remove thermostat housing and thermostat.

Fig 2: View Of Cable Clamp

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Installation: 

Keep sealing faces clean and free of oil.

Replace O-ring (1) on water pump and O-rings on connecting tube (2).

Coat O-rings on connecting tube (2) with water acting as antiseize agent.

Fig 3: Replacing O-Rings On Water Pump And Connecting Tube

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Installation: 

Preassemble thermostat (1) as shown in illustration on water pump.

Fig 4: Identifying Thermostat

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