Draining Off and Topping Up Coolant (M54)

Draining Off And Topping Up Coolant (M54)

Warning!
Danger of scalding!
Only carry out work on the cooling system after the engine has cooled down!

Recycling
Catch and dispose of drained coolant.
Observe country-specific waste-disposal regulations.

Necessary preliminary tasks:
^ Remove radiator cover.
^ Remove engine splash guard.
^ Remove reinforcement plate.

Note: Follow instructions for working on cooling system.

Draining coolant:





Open cap (1) on coolant expansion tank.





Open drain plug (1) on radiator at bottom.

Drain, catch and dispose of coolant.

Open drain plug (2) on expansion tank at bottom. Drain, catch and dispose of coolant.

Installation:
Replace sealing ring.
Tightening torque, 17 11 2AZ





Open drain plug (1) on engine block.

Drain, catch and dispose of coolant.

Installation:
Replace sealing ring.
Tightening torque 11 11 5AZ

Adding coolant:





Open vent screw (1).

Before filling:
- Switch on ignition.
- Set heater control to maximum temperature.
- Set blower to low setting. This opens the heating valves.





Perform filling operation slowly.

Close vent screw when bubble-free coolant emerges Fill coolant expansion tank to maximum cold fill level. Marking (2) is then on a level with upper edge of coolant expansion tank.

Note: Use only recommended coolant.

Vent cooling system and check for leaks.