Necessary preliminary tasks:
Remove trim panels for door pillar.
If necessary, remove air vent.
Move front seat upwards.
Release screw (1) on front seat.
Installation:
Replace screw.
Tightening
REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (N52K)
WARNING: Danger of scalding!
Only perform this work after engine has cooled down.
Recycling
Catch and dispose of drained coolant in a suitable container.
Observe country-specific waste-disposal regulations.
IMPORTANT: Protect plug connecti
Cooling System
The cooling system of the N54 engine consists of a radiator circuit and an
isolated oil cooling circuit. The fact
that there is an isolated oil-cooling circuit ensures that heat is not
introduced via the engine oil into the engine's
coolant system.
Fig. 71: Identifying Cooling S