Inspect cooling system for leaks

AR20.00-P-1010RTB

Inspect cooling system for leaks

22.8.06



Checking

 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

 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



Notes on coolant

All engines

AH20.00-N-2080-01A



Notes on coolant level

AH20.00-P-1142-01GZB

1

Open engine hood

AR88.40-P-1000RT

2

Set heating switches to maximum heating capacity

3

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

 Turn 2-stage cap half a turn in an anti-clockwise direction, release pressure, and then unscrew 2-stage cap.

4

Check coolant level

 If the antifreeze share of the coolant is too low, either add more antifreeze or replace the coolant, see: 

Drain/fill in coolant

AR20.00-P-1142RTB



Coolant specifications

Sheet 310.1

BB00.40-P-0310-01A



Anticorrosion/antifreeze agents (Sheet 325.0)

Sheet 325.0

BB00.40-P-0325-00A

5

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

 Test cap

*210589009100

6

Attach pressure pump (3) to the test connection (2)

 Pressure pump

*124589242100

7

Pressurize cooling system

 Test pressure not higher than 1.4 bar.

 If new cylinder head gasket fitted, first of all warm up engine to operating temperature before testing cooling system for leaks.

Test pressure for pressure-testing cooling system

*BE20.30-P-1005-01A

8

Check hose clamps for condition and seating

 If hose clamps are loose, tighten them or replace them.

 6 mm socket hexagon

*WH58.30-Z-1001-06A

 7 mm socket hexagon

*WH58.30-Z-1002-06A

9

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

 Replace damaged parts in order to prevent leaks.

10

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

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

 Test cap

*210589009100

11

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

 Pressure pump

*124589242100

12

Close off expansion reservoir for coolant (1) using a 2-stage test cap

13

Move heater switch to starting position

14

Close engine hood

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