Drain/fill low-temperature circuit coolant

AR20.00-P-1144RFW

Drain/fill low-temperature circuit coolant

24.11.2018

Engine

780 in model 253.992/993

8

Cap

2

Coolant hose

5

Coolant hose

3

Coolant hose

6

Plug connections

4

Coolant hose

7

Stop plug

M43/6

Low-temperature circuit circulation pump 1

 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 level

AH20.00-P-1142-01RFW

Topical note

Notes on coolant

AH20.00-N-2080-01A

Topical note

Notes on fuel cell system

AH00.00-P-0022-01RFW

Drain off

1

Ensure that the requirements for driving into the workshop are fulfilled.

Topical note

Requirements for driving into the workshop

AH00.00-P-0021-01RFW

2

Print out "tank system, fuel cell, form event log," fill out, and attach to the vehicle somewhere clearly visible.



OF00.00-P-3000-21RFW

3

Release cap (8), relieve overpressure and remove.

4

Remove front engine compartment lining.

AR61.20-P-1105LW

5

Remove underfloor paneling in the area of coolant hoses (2, 3, 4, 5).

AR61.30-P-1001RFW

6

Remove rear section of front left fender liner.

AR88.10-P-1300LW

7

Remove stop plug (7) from low-temperature circuit circulation pump 1 (M43/6).

AR20.20-P-7441-01RQ

8

Drain coolant and capture in a suitable container.

 Observe regulations to dispose of coolant.

9

Remove coolant hoses (2, 3).

 Hose clamp pliers

*454589003700

10

Collect coolant in a suitable container.

 Observe regulations to dispose of coolant.

11

Disconnect coolant hoses (4, 5) from connector couplings (6).

AR20.20-P-7441-01RQ

12

Collect coolant in a suitable container.

 Observe regulations to dispose of coolant.

Pour in

13

Install stop plug (7) in low-temperature circuit circulation pump 1 (M43/6).

AR20.20-P-7441-01RQ

14

Attach coolant hoses (2, 3).

 Hose clamp pliers

*454589003700

15

Connect coolant hoses (4, 5) to connector couplings (6).

AR20.20-P-7441-01RQ

16

Add coolant and bleed low-temperature circuit.

 Reuse clean coolant only.

 Electric motor cooling system

*BF20.00-P-1002-06H

 Electric vacuum pump

*285589022100

 NTKL Adaption

*285589012100

 Cooler vacuum filling device

*285589002100

 Test cap

*210589009100

17

Bleed low-temperature circuit with diagnostic routine.



AD00.00-P-2000-04B

18

Screw on cap (8).

19

Check low-temperature circuit for leak tightness.

AR20.00-P-1010RFW

20

Install rear section of front left fender liner.

AR88.10-P-1300LW

21

Attach underfloor paneling.

AR61.30-P-1001RFW

22

Attach front engine compartment paneling.

AR61.20-P-1105LW

 Cooling system

Number

Designation

Engine 780 in model 253.992/993

BF20.00-P-1002-06H

Electric motor cooling system

Workshop replacement amount

Low temperature circuit

Liter

5,5

Antifreeze/water

Down to -37 °C

%

50/50

-38 °C and below

%

55/45

References to sheet specification

BB00.40-P-0310ZZ