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17 00 039 Bleed Cooling System And Check For Watertightness (N52T, N53, N55)

WARNING: Risk of scalding!
Open sealing cap only after engine has cooled down.
IMPORTANT: Electric coolant pump!
FOLLOW NOTES FOR CARRYING OUT REPAIR WORK ON THE 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 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 maximum.

Fig 1: Coolant Level Marks
G06889232Courtesy of BMW OF NORTH AMERICA, INC.

Close coolant expansion tank.

Installation note: 

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

Fig 2: Coolant Expansion Tank Sealing Cap
G06889230Courtesy 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: 

Cooling system must be filled with a VACUUM FILLING UNIT  only!

Use only recommended coolant .

Observe mixture ratio .

Fig 3: Coolant Level Marks
G06889232Courtesy of BMW OF NORTH AMERICA, INC.

Venting cooling system: 

NOTE: Leave the coolant expansion tank sealing cap open 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 heater to maximum temperature and turn blower down to lowest speed.
  5. FES (driving experience switch) must not be in ECO PRO!
  6. Press accelerator pedal for 10 seconds to floor. Engine  must not  be started.
  7. The bleeding procedure was started by pressing the accelerator pedal and takes approx. 12 min. (the electrical coolant pump was activated and switches off automatically after approx. 12 min).
  8. Then adjust fluid level in the coolant expansion tank to maximum.
  9. Check  cooling system on watertightness. See 17 00 009 CHECKING COOLING SYSTEM FOR WATERTIGHTNESS (N52T)  or 17 00 009 CHECKING COOLING SYSTEM FOR WATERTIGHTNESS (N55, N63, N47 D20 O/T 1, N57 D30 U/O/T/S 0/1) .
  10. 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 mins.), then repeat from Point  2.

Close coolant expansion tank.

Installation note: 

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

Fig 4: Coolant Expansion Tank Sealing Cap
G06889230Courtesy of BMW OF NORTH AMERICA, INC.

N53 only: 

When the engine has cooled off, check the coolant level and adjust it to approx. 110 mm to 160 mm below the upper edge of the coolant filler neck (described further below in these instructions). Use a tape measure where appropriate.

Fig 5: Checking Coolant Level
G08504260Courtesy of BMW OF NORTH AMERICA, INC.

N53 only: 

Close coolant expansion tank.

Installation note: 

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

Fig 6: Closing Sealing Cap
G08504261Courtesy of BMW OF NORTH AMERICA, INC.
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