Inspect cooling system for leaks

AR20.00-P-1010FH

Inspect cooling system for leaks

24.5.11



Removing

 Danger!

Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof

Keep body parts and limbs well clear of moving parts.

AS00.00-Z-0011-01A

 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

Switch on ignition

2

Adjust heater to maximum heat output

3

Unscrew cap (1) from coolant expansion reservoir (2)

 Unscrew cap (1) slowly and relieve excess pressure.

4

Check coolant level and antifreeze content coolant

 If antifreeze content of coolant is too small, either antifreeze must be added or the coolant must be replaced.

5

Screw on test cap (3) at coolant expansion reservoir (2)



*210589009100

6

Connect pressure pump (4) at test cap (3)



*124589242100

7

Apply test pressure to cooling system

 To prevent damage to cooling system, do not exceed stated test pressure.

*BE20.30-P-1005-01A



Checking

8

Perform visual inspection on coolant carrying components

 Check condition and coolant loss for all coolant carrying components and connections. The coolant carrying components should be checked for inner leaktightness if there is no external coolant loss. There is the possibility, for example, that coolant can find its way over a defective cylinder head gasket into the combustion chamber or over a defective water heat exchanger into the oil circuits.

 Check condition and seating of the Henn coupling; replace catch springs as required in order to avoid coolant loss.

See Open and close Henn coupling.

AR09.41-P-1311-01AL



Install

9

Relieve test pressure in cooling system

 To do this actuate pressure relief button on the pressure pump (4)

10

Detach pressure pump (4) from tester cap (3)

11

Unscrew test cap (3) on coolant expansion reservoir (2)

12

Switch off ignition

13

Check coolant level and antifreeze content coolant

 Mixture ratio for coolant

*BF20.00-P-1001-04A



Notes on coolant level

AH20.00-P-1142-01CW

14

Screw screw cap onto coolant expansion reservoir (2)

Number

Designation

2-stage
cap

BE20.30-P-1005-01A

Test pressure for pressure-testing cooling system

bar gage

1.4

Number

Designation

ENGINE all

BF20.00-P-1001-04A

Mixture ratio for coolant

Antifreeze/water

up to -37°C

50/50

up to -45°C

55/45

Specifications for service products

Sheet

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-00A