17 00 039 Venting Cooling System and Checking For Water Leaks

17 00 039 Venting cooling system and checking for watertightness (N55)





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.

Observe mixture ratio.

Perform filling operation slowly.

Adjust coolant level to MAX.





Close coolant expansion tank.

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





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.





Adding coolant:

Note:
Open bleeder screw (1).

Fill coolant expansion tank up to lower edge of filler neck with recommended coolant.

Observe mixture ratio.

Close bleeder screw (1).

Close cap on expansion tank.

Installation note:
Have a cleaning cloth ready and mop up emerging coolant.

Only when venting!

Note:
Do not open the coolant expansion tank cap during the bleeding procedure.
1. Connect battery charger.
2. Switch the ignition on.
3. Set heater to maximum temperature and turn blower down to lowest speed.





4. Press accelerator pedal for 10 seconds to floor. Engine must not be started.
5. The bleeding procedure is started when the accelerator pedal is pressed and takes approx. 12 min. (Electric coolant pump was activated and shuts down automatically after approx. 12 min).
6. Then top up fill level in coolant expansion tank with 100 ml above MAX (see illustration).
7. Check cooling system for watertightness.
8. 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.

Close coolant expansion tank.

Installation note:





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