How to bleed your BMW cooling system. Bleeding your BMW.
Results 1 to 7 of 7
  1. #1
    A clever person solves a problem. A wise person avoids it.
    Administrator
    Ronnie's Avatar
    Join Date
    Mar 2012
    Location
    Dorset.
    Posts
    8,239
    Car Specs:
    Year
    1987
    Model
    Racing Shed
    Engine
    1.2l
    Fuel
    1/2 a tank.
    Thanks
    5,794
    Thanked 4,661 Times in 3,034 Posts


    Donate Please click the
    image to support
    BMWForums.info
    Click Here To Contribute To Our Site

    How to bleed your BMW cooling system. Bleeding your BMW.

    How to bleed the cooling system.
    1. Jack the front of the vehicle up onto stands as high as possible,
    2. Turn the ignition on to Aux 2, Engine OFF, heater on fan setting 1 and temperature fully hot,
    3. Remove the rad cap/expansion cap,remove the bleed screw from the radiator and IF you have them the bleed screw(s) from the thermostat housing/top hose, return pipe or EGR thermostat.
    4. Fill the radiator/expansion tank up and keep pouring till there are no more air bubbles coming out from the bleeds, using a funnel that fits tight in the expansion tank neck and filling it full of water will help push any troublesome air out, when good you can then install the bleeds and tighten down(don't snap them),ensure the rubber O-rings/seals are still on the screws/on the bleed holes.
    5. Suck some water out so it's not full to the brim, start the car up and check coolant shoots out of the small hole on the inside of the expansion tank neck when the revs are held up, if it does then run the car up for 30 seconds, then switch it off and repeat steps 3 onwards to ensure no more trapped air is in the system,
    6. Refit your radiator cap and run the car up, check for heat from the vents when the car is warm, then carry on and check if over heating still persists. You may have to bleed troublesome cars again afterwards.(but very rare).
    7. If all is good then check the water level again in the morning when cool.

    Or alternatively.

    Ignition on, heater set to hot, bleed screw out.
    Pull the top hose off the radiator. Pour coolant SLOWLY down the rad hose a litre at a time. When the coolant is building up in the hose, hold it above the level of the rad hose stub and keep adding it. When coolant starts to dribble from the rad, refit the hose. You may find that coolant starts to overflow from the rad cap orifice - if it does, just screw the cap back on. Once you've done that, the engine and radiator are full of coolant - the little air pockets that might be left will come through the bleed screw.

    After the vehicle is bled you should check that when the revs are held up you get a flow of coolant shooting out of the hole on the inside of the expansion tank neck, this will help tell you if the water pump is circulating, then run the car up and check the lower radiator hose gets hot.
    If problems persist you could also get a "block test" performed to tell you whether the head gasket has gone.
    Please donate Here to help support the site.
    BMW Forums.info - Vendors
    Harry Fairbairn BMW - Massive 15% discount on genuine BMW parts.
    Essex Turbo - Turbo Specialist.
    Skyinsurance - Insurance Specialist.
    BMWForums.info.(BFI) The best BMW forum.
    BMW Forums.info Facebook page.
    BMW Forums.info Facebook group.
    BFI Nightshift Crew President.

  2. The Following 10 Users Say Thank You to Ronnie For This Useful Post:

    Bmw320d SE (15-01-2013),carl robson (22-06-2012),Emil (24-06-2012),ging320 (13-06-2016),mjojom (22-06-2012),MoreaTourer (30-04-2013),RobbieV (22-06-2012),shoshinsha (22-06-2012),tulip (27-06-2013),wanda (15-12-2012)

  3. #2
    BFI Senior
    shoshinsha's Avatar
    Join Date
    Apr 2012
    Location
    Ireland
    Posts
    450
    Car Specs:
    Year
    99
    Model
    E36 318is
    Engine
    1.9
    Fuel
    Petrol
    Thanks
    382
    Thanked 380 Times in 249 Posts


    Great write up and fair play for taking the time to do it. It shall be appreciated on here for sure.


    Super4
    Sent using tapatalk app

  4. The Following User Says Thank You to shoshinsha For This Useful Post:

    Ronnie (23-06-2012)

  5. #3
    BFI Veteran
    M3 tim's Avatar
    Join Date
    Apr 2012
    Location
    Derbyshire
    Posts
    2,063
    Car Specs:
    Year
    1998
    Model
    M3 evo vert
    Engine
    3.2 m3
    Fuel
    Petrol
    Thanks
    1,094
    Thanked 1,270 Times in 792 Posts


    Ive used your write up more than a few times, brilliant cheers.

  6. The Following User Says Thank You to M3 tim For This Useful Post:

    Ronnie (23-06-2012)

  7. #4
    Funky mark
    BFI Member
    Funky mark's Avatar
    Join Date
    Dec 2012
    Location
    Stoke on Trent
    Posts
    185
    Car Specs:
    Year
    2004
    Model
    E60
    Engine
    2.2
    Fuel
    Petrol
    Thanks
    57
    Thanked 52 Times in 44 Posts


    Thanks lads, did on my old e36 with bleed screw, notice on e39 m54 engine there bleed screw near fill tank, on my m54 it different and hear its self bleed?

  8. #5
    Member
    BFI Stalwart
    Nath330's Avatar
    Join Date
    Apr 2012
    Location
    Medway, Kent
    Posts
    593
    Car Specs:
    Year
    2002 & 1987
    Model
    e46 330ci clubsport & e30 325i sport
    Engine
    m54b30 & m2b25
    Fuel
    petrol
    Thanks
    323
    Thanked 265 Times in 195 Posts


    M54's are most definitely not self bleed lol. mine took about 45 mins to get all the air out using the bleed screw near the filler.

    Bmw 330ci Clubsport
    (Formerly known as bimmer320)

  9. #6
    Unverified Member
    toojohnny's Avatar
    Join Date
    Sep 2015
    Location
    Essex
    Posts
    1
    Car Specs:
    Year
    1998
    Model
    E36
    Engine
    318i
    Fuel
    Petrol
    Thanks
    0
    Thanked 0 Times in 0 Posts


    Hi there, I too am having heater issues, and suspect that the radiator has not been bled correctly for some time.

    Maybe I am being a bit dumb, but with the engine off the water wasn't circulating, and it wasn't bleeding any air out! I thought the engine needed to be running, and for the bleed screw to be out?

    I had front of car raised, and heater on max (32 on climate control). It is coming through warm, but I wouldn't say hot. Car has air con, but that doesn't get cold anymore!

    I replaced the radiator myself last year, but have had to top up with coolant due to leak(s) somewhere. I just want to get the bleeding right, and with the engine off (even with the heater on max) it doesn't seem to do anything.

    Help! (please)

  10. #7
    Unverified Member
    kidzmurals's Avatar
    Join Date
    Dec 2016
    Location
    GB
    Posts
    1
    Car Specs:
    Year
    2001
    Model
    e46
    Engine
    325ti
    Fuel
    petrol
    Thanks
    0
    Thanked 0 Times in 0 Posts


    Hi im having a problem with my heaters they are blowing cold air from drivers side and warm air from passengers side the car is a right hand drive and a 325ti compact anyone know why and how to fix please tony

    Sent from my SM-G9250 using Tapatalk

User Tag List

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •