Remove/install coolant thermostat

AR20.10-P-2460VA

Remove/install coolant thermostat

20.7.09

 

Remove/install

Danger!

Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by swallowing coolant.

Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.

Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Danger!

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.

AS00.00-Z-0010-01A

1

Raise vehicle with vehicle lift

AR00.60-P-1000V

2

Remove the front and central sections of the lower engine compartment paneling

AR61.20-P-1105V

3

Drain coolant at radiator

AR20.00-P-1142VA

4

Open engine hood and raise to vertical position

AR88.40-P-1000V

5

Remove left engine intake air duct and front engine cover

See "Remove/install air filter housing".

AR09.10-P-1150VA

6

Detach top coolant hose (1) from coolant thermostat housing (2) and place it on the side

 Installation: Replace O-ring (1a).

7

Remove poly-V belt

AR13.22-P-1202VA

8

Remove guide pulley (3) of poly-V belt



*BA20.10-P-1004-01U

9

Unlatch electrical connector at three-disk thermostat valve (Y110) and disconnect

10

Remove bolts (2a, 2 pieces)



*BA20.10-P-1003-01U

11

Pull out coolant thermostat housing (2) with coolant thermostat from timing case cover

 The coolant thermostat and coolant thermostat housing (2) are a single unit. The coolant thermostat must not be taken out of coolant thermostat housing (2) as it can get damaged in the process.

 Installation: Replace gasket (2b) and O-ring (2c).

12

Install in the reverse order

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

13

Conduct an engine test run and check the cooling system for leaks

Number

Designation

Engine 272

BA20.10-P-1003-01U

Bolt, coolant thermostat housing to timing case cover

Nm

25

BA20.10-P-1004-01U

Bolt, guide pulley between water pump and belt tensioner

Initial installation

Nm

35

Follow-up operations

Nm

25