Inspect cooling system for leaks

AR20.00-P-1010GZS

Inspect cooling system for leaks

20.6.06



Checking

 Danger!

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

 Danger!

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

Keep body parts and limbs well clear of moving parts.

AS00.00-Z-0011-01A

1

Open engine hood

Model 164

AR88.40-P-1000GZ

Model 251

AR88.40-P-1000RT

2

Open cap of coolant expansion reservoir (1)

 Turn the cap slowly and release the excess pressure, then unscrew the cap.

3

Check coolant level and antifreeze content coolant.

 If the antifreeze share of the coolant is too small, either antifreeze must be added or the coolant must be replaced: 

Drain, fill system with coolant.

AR20.00-P-1142GZS



Notes on coolant

All engines

AH20.00-N-2080-01A



Note on coolant level

AH20.00-P-1142-01GZB



Coolant specifications

Sheet 310.1

BB00.40-P-0310-01A



Anticorrosion/antifreeze agents (Sheet 325.0)

Sheet 325.0

BB00.40-P-0325-00A

4

Screw test cap (2) onto coolant expansion reservoir (1).

 Test cap

*210589009100

5

Connect up pressure pump (3) at test cap (2)

 Pressure pump

*124589242100

6

Discharge cooling system with test pressure

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

Test pressure for pressure-testing cooling system

*BE20.30-P-1005-01A

7

Check hose clamps for condition and seating

 Retighten or replace hose clamp as required.

 Hose clamp pliers

*003589033700

 6 mm socket hexagon

*WH58.30-Z-1001-06A

 7 mm socket hexagon

*WH58.30-Z-1002-06A

8

Check coolant hoses and heater hoses and their connecting points for condition and coolant loss

 Replace coolant hoses and heater hoses if required.

9

Unscrew test cap (2) at coolant expansion reservoir (1).

 Slowly unscrew test cap (2) and reduce the excess pressure.

10

Remove pressure pump (3) at test cap (2)

11

Screw on the cap of the coolant expansion reservoir (1)

12

Close engine hood

Model 164

AR88.40-P-1000GZ

Model 251

AR88.40-P-1000RT

Number

Designation

2-stage
cap

BE20.30-P-1005-01A

Test pressure for pressure-testing cooling system

bar gage

1.4

Number

Designation

WH58.30-Z-1001-06A

6 mm socket hexagon on flexible shaft for hose clamps with worm drive

WH58.30-Z-1002-06A

7 mm socket hexagon on flexible shaft for hose clamps with worm drive