17 00 039 Venting cooling system and checking for watertightness (N55)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

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

IMPORTANT: Electric coolant pump!
Follow instructions for working on cooling system .

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 partial quantities of coolant, replace these quantities which have been drained with new coolant.

Only when refilling!

Use only recommended coolant . See COOLING SYSTEM - OPERATING FLUIDS .

Observe mixture ratio . See COOLING SYSTEM - OPERATING FLUIDS .

Perform filling operation slowly.

Adjust coolant level to MAX.

Fig 1: Adjust Coolant Level To Max

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Close The Sealing Cap (1) Until The Arrows Line Up

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The following bleeding procedure is necessary e.g. when a part is replaced in the cooling system or when the cooling system is refilled.

Adding coolant: Open bleeder screw (1). Fill coolant expansion tank up to lower edge of filler neck with recommended coolant. See Fig 1. Observe mixture ratio. Close bleeder screw (1). Close cap on expansion tank.

NOTE: Have a cleaning cloth ready and mop up emerging coolant.

Only when venting!

NOTE: Do not open the coolant expansion tank cap during the bleeding procedure.

Connect battery charger.
Switch the ignition on.
Set heater to maximum temperature and turn blower down to lowest speed.
Press accelerator pedal for 10 seconds to floor. Engine must not be started.
The bleeding procedure is started when the accelerator pedal is pressed and takes approx. 12 min. (Electric coolant pump was activated and shuts down automatically after approx. 12 min).
Then top up fill level in coolant expansion tank with 100 ml above MAX.
Check cooling system for watertightness.
If venting has to be carried out again (e.g. if cooling system is leaking), allow DME to fall completely (leave ignition key removed for approx. 3 min), 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=6 mm.

Fig 3: Fill Coolant Expansion Tank With 100 Ml Above Max. (100 Ml Corresponds To A=6 mm)

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 4: Close The Sealing Cap (1) Until The Arrows Line Up

Courtesy of BMW OF NORTH AMERICA, INC.