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Cooling system, checking air tightness

Cooling system, checking air tightness


1. Open the bonnet

Warning: only open the coolant equalising container when the engine is cold

2. Unscrew the coolant equalising container cap

3. Check the coolant level.

Coolant equalising container

Instruction: to the marking KALT/COLD - fill with coolant as necessary

4. Fit the cooling system tester (1)

Use KM-471 (2), KM-6327 (3) or 30 05 477 Cooling system tester , 30 05 469 Adapter, cooling system tester and 83 96 160 Pressure test adapter, cooling system B207


5. Increase the pressure in the cooling system

Instruction: apply pressure of approximately 100 kPa (1 bar) to the cooling system.

6. Check cooling system tightness

Check for leaks

7. Remove the cooling system tester

Lower the pressure

Remove KM-471, KM-6327 or the alternative tools.

8. Screw on the coolant equalising container cap

9. Close the bonnet