17 00 005 Draining and adding coolant (N12)

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 water 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: Identifying Lower 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.

The cooling system is vented during filling.

NOTE:

Installation location of vent screw: thermostat housing.
For purposes of clarity, illustration shows and text refers to released cable duct (1).

Release vent screw.

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

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.

Fig 3: Identifying Cable Duct

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

Close expansion tank.

Fig 4: Identifying Coolant Level

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NOTE: Check cooling system for leaks .