17 00 039 Venting Cooling System and Checking For Water Leaks

17 00 039 Bleed cooling system and check for watertightness (N52T, N55)







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







IMPORTANT: Electric coolant pump.







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 when a part is replaced in the cooling system or when the cooling system is refilled.







Adding coolant:

NOTE:
Fill coolant expansion tank up to lower edge of filler neck with recommended coolant.
Observe mixture ratio.
Observe filling capacities.
Close cap on expansion tank.

Installation note:
Have a cleaning cloth ready to catch escaping coolant.







Bleed cooling system:

NOTE:
Do not open the coolant expansion tank cap during the bleeding procedure.
Switch on the low-beam headlights to perform the bleeding procedure. If the low-beam headlights are not switched on, the ignition (Terminal 15) will switch off automatically after a certain period of time and interrupt the bleeding procedure.

1. Connect battery charger.
2. Switch the ignition on.
3. Switch on low-beam headlight.
4. Set heating to maximum temperature. Take back blower to smallest stage.
5. Press accelerator pedal for 10 seconds to floor. Engine must not be started.
6. The venting procedure is started when the accelerator pedal is pressed and takes approx. 12 minutes. (Electric coolant pump was activated and shuts down automatically after approx. 12 min).
7. Then adjust fluid level in the coolant expansion tank to max.
8. Check the coolant system for leaks.
9. If the ventilation has to be performed again, deactivate DME completely (remove ignition key for approx. 3 minutes). Then repeat from point 3.







Close coolant expansion tank.

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