Drain/fill low-temperature circuit coolant

AR09.41-P-6834MRT

Drain/fill low-temperature circuit coolant

09.11.2018

Engine

256.9 in model 222

1

Engine compartment paneling

2

Cap

4

Coolant hose

5

Hose connector

6

Coolant hose

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from 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

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW



Remove

1

Remove engine compartment lining (1).

2

Remove cap (2).

3

Remove lower engine compartment paneling.

AR61.20-P-1105LF

Drain off

4

Release and disconnect hose connector (5) and collect escaping coolant in suitable container.

AR20.20-P-7441-01RQ

5

Remove coolant hose (4) from low-temperature circuit cooler and collect escaping coolant in suitable container.

AR20.20-P-7441-01RQ

6

Remove coolant hose (6) from automatic transmission fluid oil cooler and collect escaping coolant in suitable container.

AR20.20-P-7441-01RQ



Install

7

Connect hose connector (5) and lock.

AR20.20-P-7441-01RQ

8

Attach coolant hose (4) to low-temperature circuit cooler.

AR20.20-P-7441-01RQ

9

Attach coolant hose (6) to automatic transmission fluid oil cooler.

AR20.20-P-7441-01RQ

Pour in

10

Pour in coolant and bleed low-temperature circuit engine cooling system.

AR20.00-P-1142-04OLC

 Use clean coolant.

 Cooling system

*BF20.00-P-1001-06MRT

Test pressure for pressure-testing the engine cooling system

*BE20.30-P-1005-01A

 Cooler vacuum filling device

*285589002100

 Electric vacuum pump

*285589022100

 Pressure pump

*124589242100

 Test cap

*210589009100

 NTKL Adaption

*285589012100



Check

11

Check low-temperature circuit for leak tightness.

AR09.41-P-1011MNL

Radiator or expansion reservoir cap

Number

Designation

Engine 100, 102, 103, 104, 110, 111, 112, 113, 114, 115, 116, 117, 119, 120, 121, 123, 127, 129, 130, 133, 137, 139, 152, 155, 156, 157, 159, 166, 180, 256, 260, 264, 266, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 282, 285
2-stage latch cover
Engine 601, 602, 603, 604, 605, 606, 607, 608, 611, 612, 613, 615, 616, 617, 621, 626, 628, 629, 640, 642, 646, 648, 651, 654, 656, 668
2-stage latch cover

BE20.30-P-1005-01A

Test pressure for pressure-testing the engine cooling system

Overpressure

bar

1,4

 Cooling system

Number

Designation

Engine 256 in model 222

BF20.00-P-1001-06MRT

Cooling system

Workshop replacement amount

Main circuit

Liter

13

Low-temperature circuit

Liter

2,5

Antifreeze/water

to -37 °C

%

50/50

as from -38 °C

%

55/45

Specifications for Operating Fluids, sheet

BB00.40-P-0310-01A

Specifications for Operating Fluids, sheet

BB00.40-P-0325-06A

Specifications for Operating Fluids, sheet

BB00.40-P-0326-06A