17 00 005 Draining and adding coolant (N14)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

WARNING: Danger of scalding!
Only carry out work on the cooling system after the engine has cooled down!

IMPORTANT: Wear protective gloves and goggles.

After adding coolant, check cooling system for leaks.

Draining coolant:

Unscrew cap (1) on coolant expansion tank.

Fig 1: Identifying Coolant Expansion Tank Cap

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Release spring strap on lower coolant hose (1) with special tool 17 2 051.

Detach coolant hose (1). Drain, catch and dispose of coolant.

Fig 2: Locating Coolant Hose

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Adding coolant:

NOTE: Before filling, turn on ignition and set heating control to maximum temperature.
Set fan to sow setting.
Pour in coolant slowly.

Observe mixture ratio.

The cooling system is vented during filling.

NOTE:

Release vent screw (1).

Pour in special coolant through expansion tank filler neck until bubble-free coolant emerges at vent screw (1).

Close bleed screw (1).

Fig 3: Identifying Vent Screw

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Continue topping up coolant in expansion tank to max. level (1).

Start engine and run at idle speed.

If the level drops, top up coolant until the level no longer drops.

Switch off engine and if necessary top up coolant to max. level.

Close expansion tank.

Fig 4: Identifying Max. Level In Expansion Tank

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NOTE: Check cooling system for leaks