17 00 039 Venting cooling system and checking for watertightness (N54)

WARNING: Risk of scalding!
Open sealing cap only after engine has cooled down.

IMPORTANT: Electric coolant pump!
FOLLOW NOTES FOR CARRYING OUT REPAIR WORK ON THE COOLING SYSTEM .

IMPORTANT: Lifetime coolant filling:

Never reuse used coolant!

When replacing and removing components which rely on the corrosion protection effect of the coolant, it is essential to change the coolant. The cooling system must therefore be drained and refilled.

In the case of other removal work involving the draining of part quantities of coolant, replace these quantities which have been drained with new coolant.

Only when refilling!

Use only recommended coolant. See RADIATOR -- OPERATING FLUIDS .

Observe mixture ratio. See RADIATOR -- OPERATING FLUIDS .

Perform filling operation slowly.

Adjust coolant level to MAX.

Fig 1: Identifying Coolant Level To Maximum Mark

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Close coolant expansion tank.

Installation note:

Close the sealing cap (1) until the arrows line up.

Fig 2: Identifying Close Sealing Cap

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IMPORTANT: The following bleeding procedure is necessary e.g. when a part is replaced in the cooling system or when the cooling system is refilled.

Vehicles with independent heating only

Open bleeder screw (1).

Slowly fill coolant expansion tank with recommended coolant. See RADIATOR -- OPERATING FLUIDS .

Close bleeder screw (1) after coolant emerges.

Installation note:

Have a cleaning cloth ready and mop up emerging coolant.

Fig 3: Identifying Close Vent Screw

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Adding coolant

NOTE: Open bleeder screw (1).

Fill coolant expansion tank up to lower edge of filler neck with recommended coolant. See RADIATOR -- OPERATING FLUIDS .

Observe mixture ratio. See RADIATOR -- OPERATING FLUIDS .

Close bleeder screw (1).

Close cap on expansion tank.

Installation note:

Have a cleaning cloth ready and mop up emerging coolant.

Fig 4: Identifying Bleeder Screw

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Only when venting!

NOTE: Do not open the coolant expansion tank cap during the bleeding procedure.

Connect battery charger.
Switch the ignition on.
Set heater to maximum temperature and turn blower down to lowest speed.
Press accelerator pedal for 10 seconds to floor. Engine must not be started.
The bleeding procedure was started by pressing the accelerator pedal and takes approx. 12 min. (the electrical coolant pump was activated and switches off automatically after approx. 12 min).
Then top up fill level in coolant expansion tank with 100 ml above MAX (see Fig 5).
17 00 009 CHECKING COOLING SYSTEM FOR WATERTIGHTNESS .
If venting has to be carried out again (e.g. if cooling system is leaking), allow DME to fall completely (leave ignition key removed for approx. 3 min), then repeat from Point 3.

Only when venting!

Perform filling operation slowly.

Fill coolant expansion tank with 100 ml above MAX.

100 ml corresponds to A=6 mm.

Fig 5: Checking Coolant Expansion Tank Capacity

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Close coolant expansion tank.

Installation note:

Close the sealing cap (1) until the arrows line up.

Fig 6: Identifying Closed Sealing Cap

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