17 00 039 Venting cooling system and checking for water leaks (M57TU, M57T2)
WARNING:
Danger of scalding!
Only perform this work after engine has cooled down.
IMPORTANT:
Protect alternator against coolant.
Cover alternator with suitable apparatus (risk of damage) .
Filling and venting instructions with auxiliary heater .
- Switch off engine, coolant temperature ≤ 40°
- Open cap on expansion tank (AGB)
- Open vent screws.
- On EGR cooler thermostat
- On coolant return pipe
- Switch ignition on
- Seat heating to maximum temperature and fan to low speed (heater valves are opened and auxiliary water pump starts up)
- Add coolant slowly
- Close vent screws after coolant emerges or after filling up to max. cold fill level
- Fill expansion tank to maximum cold fill level
- Start engine and run at idle for 5 minutes (top up coolant to maximum cold fill level if required)
- Close cap on expansion tank , press accelerator pedal several times to approx. 2500 RPM
- Open cap on expansion tank , run engine at idle for a further 5 minutes (bubble-free coolant emerges at vent line in expansion tank)
- Fill to maximum cold fill level
- Top up expansion tank with an additional 250 ml
- Close expansion tank cap
Additional instructions for cars with optional extra independent heating:
- Switch off engine
- Run independent heating for approx. 2 minutes
- Start engine and run briefly at idle
- Press accelerator pedal twice up to approx. 2500 RPM
- Open cap on expansion tank and add coolant up to max. cold fill level
- Top up expansion tank with an additional 250 ml
Check cooling system for leaks.