Remove/install coolant thermostat

AR20.10-D-2460WE

Remove/install coolant thermostat

23.5.11

21.5.10

Repair method has been revised

"Remove engine wiring harness cable duct" added

Step 5

"Special tool set, flexible head wrench 001 589 81 09 00 and basic data" added

Step 11

"Basic data" added

Operation step 13

 

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

1

Remove engine trim panel

 Installation: Only install engine cover after checking for leaks.

AR01.10-D-2405WE

2

Drain coolant

AR20.00-D-1140SD

3

Open Henn coupling and remove coolant hose (2) on coolant thermostat (1)

 Installation: Install new sealing ring.

AR09.41-P-1311-01AL

4

Pull coolant hoses (6, 7) off of coolant thermostat (1) and place aside

 Installation: check clamps and coolant hoses (6, 7) for damage, replace if necessary.

 Hose clamp pliers

*003589033700

5

Detach engine wiring harness cable duct (3)

AR01.00-D-2411-01WE

6

Disconnect electrical connector (5) at coolant temperature sensor (B11/17)

7

Disconnect electrical connector (4) from heating element thermostat (R48/2)

8

Disconnect electrical connector (9)

9

Disconnect electrical connector (11) on glow plug cylinder 1

 Pull off old version electrical connector (11) with  pliers.

Pull off new version electrical connector (11) with commercially available needle nose pliers.

 Pliers

*611589003700

10

Unscrew bolt (8)

11

Remove bolts (10, 13) and bracket (12)



*BA14.20-N-1027-01H



*BA14.20-N-1028-01H

 Flexible head wrench set

*001589810900

12

Detach coolant hose clamp (14)

 Installation: Check coolant hose (14) and clamp for damage; replace if necessary.

13

Remove screws/bolts (17)



*BA20.10-N-1006-01Q

14

Pull coolant thermostat (1) out of carrier (18), remove coolant hose (14) and coolant thermostat (1)

 Installation: Replace connection piece (15) and sealing ring on connection fitting (16).

15

Remove coolant temperature sensor (B11/17)

 When replacing coolant thermostat (1).

16

Install in the reverse order

17

Inspect cooling system for leaks

AR20.00-S-1010S

Number

Designation

Engine
651 in model 900

Engine
651 in model 906

BA14.20-N-1027-01H

Bolt, exhaust gas recirculation cooler/vacuum reservoir bracket to support brace

Nm

9

9

BA14.20-N-1028-01H

Bolt, support to cylinder head

Nm

9

9

Number

Designation

Engine
651
in model 900

Engine
651
in model 906

BA20.10-N-1006-01Q

Bolt, coolant connection fitting to cylinder head

Nm

10

10