17 00 039 Venting Cooling System and Checking For Leaks

17 00 039 - Venting cooling system and checking for leaks (N52)





Warning!
Danger of scalding!
Open sealing cap only after engine has cooled down.

Important!
Electric coolant pump!





Only when refilling!

Important!
Do not fill coolant expansion tank over MAX level as overfilling will cause the coolant to overflow. This may give rise to traces of residual coolant on the expansion tank or in the engine compartment and wrongly suggest possible leakages.





Only when refilling!
Use only recommended coolant.
Perform filling operation slowly.
Adjust coolant level to MAX.





Close coolant expansion tank.

Installation Note:
Close cap (1) until the arrow marks line up.





Important!
The following venting procedure is necessary e.g. when a part is replaced in the cooling system or when the cooling system is refilled.





Only when venting!

Note:
Fill coolant expansion tank up to lower edge of filler neck with recommended coolant. Close cap on expansion tank.
Do not open the coolant expansion tank cap during the venting procedure.

1. Connect battery charger.
2. Switch on ignition.
3. Set heater to maximum temperature, activate "Automatic" button, then reduce fan to lowest setting.
4. Press accelerator pedal for 10 seconds to floor. Engine must not be started.
5. The venting procedure is started when the accelerator pedal is pressed and takes approx. 12 minutes.
6. Then top up fill level in coolant expansion tank with 100 ml above max (see illustration).
7. Check cooling system for leaks Component Tests and General Diagnostics.
8. If the venting procedure has to be carried out several times, allow DME to drop completely (ignition key removed for approx. 3 minutes), 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=7 mm.