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BMW Coolant Bleeding How To – Electric Waterpump, Water Pump – No Bleeder Screw

December 7, 2012

This answer is applicable for many BMWs in addition to the one listed below.

Q
2006 525i
I am one of your regular customers and I need to flush my engine coolant on a 2006 BMW 525i. I already ordered what is needed and wanted to know if you have a DIY guide/video for my specific car (2006 5 series). I did look at one of your videos and it was more general and I am unable to find the bleed screw for my coolant system. Any help and advice you could provide would be greatly appreciated.

A
We do not have a DIY that specifically covers your 525i.  Many later model BMWs that have the new electrically operated water pumps may or may not have the common bleeder screws and are not bled in the same manner as the older models with mechanical engine driven water pumps. On these models, the electric engine coolant pump is used to perform the cooling system bleeding operation.  This applies to the following models with the gasoline 4-cylinder and 6-cylinder “N” series engines (up through the date of this posting):

E82, E88 1-series – 128i, 135i, 135is
E90, E91, E92, E93 3-series – 325i, 325xi, 328i, 330i, 330xi, 335i, 335xi
F30, F31 3-series – 328i, 335i, 335is
E60, E61 5-series – 525i  & 525xi (06-on), 528i, 528xi, 530i & 530xi (06-on), 535i, 535xi
F07, F10, F11 5-series – 535i GT, 535ix GT, 528i, 528ix, 530i, 535i, 535ix
E83 X3 – 2.5i & 3.0i 07-10
F25 X3 – 28ix, 35ix
E70 X5 – 3.0si, 35ix
E71 X6 – 35xi
E86, E86 Z4 – 3.0i 05-08, 3.0si
E89 Z4 – 28i, 30i, 35i, 35is

COOLANT BLEEDING PROCEDURE:

Click HERE for DIY coolant flush and bleed video

NOTE:  The applicable Bentley repair manual will cover the model specific details for the coolant bleeding procedures.

  • On models that have a bleeder screw on the lower radiator hose and/or on the expansion tank, open the bleeder (s) (if not equipped, ignore this).
  • Fill expansion tank slowly with the 50/50 coolant mixture.
  • If bleed screws were opened, close each as the coolant begins to come out of the bleeder.
  • Once the bleeder on the expansion tank (if equipped) is flowing coolant and has been closed, fill expansion tank to the lower edge of the filler neck.
  • Install the coolant cap.
  • Connect a battery charger to the battery or jumper cable ports under the hood.
  • Turn ignition to the ON position.  If equipped with a START button, push button (with key fob installed or active), but do not depress the brake or clutch pedals.  This will turn the ignition on, but not crank the starter.
  • Set heater temp to MAX and blower to low speed.
  • Press the accelerator pedal to the floor for 10 seconds.
  • The self bleeding procedure will begin (via the electric water pump) and will run for about 12 minutes.  During this time the water pump will alternately turn on and off.  Do not remove cap while bleeding procedure is running.
  • When bleeding is complete, double check coolant level and adjust as required.  Replace coolant cap.

Click below for Bentley repair manuals:

BMW Coolant:

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