11 53 000 Removing and installing/replacing coolant thermostat (S65)

WARNING: This page is about a different variant/trim than selected.

Necessary preliminary tasks:

Release unlocking element (1).

Detach vent line (2).

Fig 1: Identifying Vent Line And Unlocking Element

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Disconnect FUEL LINE from fuel rail.

Release screws (2).

Unlock wiring harness of fuel injectors (1).

Fig 2: Identifying Fuel Injectors And Screws

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Clip injection pipe (1) out of holder (2).

Lay injection pipe, cylinders 5 to 8, to one side.

Fig 3: Identifying Injection Pipe And Holder

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Disconnect plug connection (1) on coolant temperature sensor.

Disconnect plug connection (2) on solenoid valve.

Fig 4: Identifying Plug Connections

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Unlock coolant hoses and detach.

Release screws (1).

Installation:

Replace sealing rings.

Fig 5: Identifying Screws

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Remove thermostat housing with thermostat forwards in direction of arrow.

Clean sealing surfaces.

Fig 6: Removing Thermostat Housing

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Remove thermostat (1).

Check rubber section (2) for damage.

Remove connecting pipes (2).

Installation:

Replace all O-rings on connecting pipes.

Fig 7: Identifying Connecting Pipes And Thermostat

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Assemble engine.

Vent COOLING SYSTEM and check for leaks.