Inspecting the cooling system for leaks

AR20.00-P-1010RR

Inspecting the cooling system for leaks

27.5.03



Remove

 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

1

Open cap (1) on expansion reservoir (2)

Turn cap half a turn in the counterclockwise direction, release pressure, and then unscrew cap.



Checking



Notes on coolant

All engines

AH20.00-N-2080-01A

2

Check coolant level and antifreeze

 If the antifreeze protection of the coolant is inadequate, either antifreeze must be topped up, or the coolant must be replaced, see: 

Drain coolant, fill.

AR20.00-P-1142RR

3

Connect tester to expansion reservoir (2)

 Pressure pump

*450589072100

4

Pressurize cooling system

 Test pressure not greater than 1.6 bar.

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

*BE20.30-P-1005-01A

5

Inspect coolant pump for leaktightness

AR20.10-P-1273RR

6

Check condition and seating of hose clamps and retighten or replace as necessary

7

Inspect cooling and heating hoses as well as their connection points for proper condition and coolant loss, replace coolant hoses if necessary

8

Detach tester on expansion reservoir (2)

 Pressure pump

*450589072100



Installing

9

Screw cap (1) onto expansion reservoir (2)

Number

Designation

Engines
160.921/
923
in model
452.3/4

Engine
160.922
in model
452.3/4

BE20.30-P-1005-01A

Test pressure for pressure-testing cooling system

bar gage

1.6

1.6