BMW 740 Ninja 650 Other Stuff Contact Page FAQ & Legal

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Ok, so from time to time you might encounter air in the coolant system and need to bleed it.  This could come after you've done a repair, drained and refilled the coolant system, changed out the hoses and so on. 

This car can be very tricky to bleed the air out of the system, but I feel that I have mastered bleeding the system so let me share it with you!



  • Philips head or Flat head screwdriver
  • Coolant [Phosphate Free], I recommend BMW coolant even thought it is so expensive
  • Distilled Water
  • Towels or Rags
  • Drain Pan to catch the coolant
Please Click On Any Picture Below To Enlarge That Picture.
First remove the expansion tank cap [1], bleeder valve and o-ring [2].  Number 1 and 2 in the pic, then follow the directions below:
  • To fill and bleed the system it helps to a 2 people but is not necessary.
  • Mix the proper mixture of coolant and water, I use 50/50 because of the climate I live in.  ONLY use Distilled Water and Phosphate Free Coolant.
  • Fill the expansion tank SLOWLY until the dipstick tells you it’s full.
  • Put the key in the car, turn it to position 2 and turn the heater temp up to 90 degrees and put the fan speed to nothing.
  • Now start the car.
  • Go back to the front and SLOWLY refill coolant as needed until the dipstick says full, refill as necessary.
  • Once the cars temp has hit the first white notch on the temp gauge, have your helper rev the RPM’s to 1000 and hold it there.
  • You’ll start to see bubbles coming out of the expansion tanks bleeder valve [2 in pic].
  • Wipe as necessary or let your pan catch it, your choice.
  • Once the bubbles stop, and it appears to be all coolant let it keep going……….for about 30 seconds.
  • Then let off the gas just to an idle.
  • Close off the bleeder screw, put the expansion tank cap on and you’re DONE……..!!!!!
  • The following morning, BEFORE starting the car, check the coolant level and fill to appropriate level.

That's it, you're done!



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