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

Necessary preliminary tasks: 

• Remove intake air manifold  . 
• Drain coolant.  See 17 00 005 DRAINING AND ADDING COOLANT (S65) .

Release unlocking element (1).

Detach vent line (2).

Fig 1: Identifying Unlocking Element And Vent Line

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Disconnect fuel line  from fuel rail. See 13 53 240 REPLACING COMPLETE INJECTION PIPE (S65) .

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 Solenoid Valve Plug Connection And Coolant Temperature Sensor Plug Connection

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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 With Thermostat

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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 Thermostat And Rubber Section

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Assemble engine.

Vent cooling system  and check for leaks. See 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR WATER LEAKS (S65) .