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Thread: Heater Core Blew...

  1. #1
    Join Date
    Mar 2010
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    Vancouver, BC
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    1990 BMW 850i, 1976 Nova

    Heater Core Blew...

    noticed humidity on my wind-shield and just later noticed antifreeze puddle under my car... luckily i didn't run out of water and overheat!! In any event it's under repair now and should be completed tomorrow... its listed at 9 hours labour... gonna run a cool G note...

    I'm more concerned how well it will be reassembled...

    Any tips for things i should look for when completed?
    "...i haven't taken leave of my senses Bob, I've come to them..." -- Ebenezer Scrooge

  2. #2
    Join Date
    Dec 2007
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    Dallas, TX
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    '93 850Ci- Daily Driver
    Check to see that ALL your electrical connections behind the dash were done properly. You might also notice done new squeaks and rattles...
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  3. #3
    Join Date
    Nov 2005
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    Langley BC Canada
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    My Cars
    91 850 Panzer
    More coolant under the car.... 8-)
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  4. #4
    Join Date
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    Wish I could of made that G note, Would of charged you a set of vents and a pizza.

  5. #5
    Join Date
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    91 850i
    1991 BMW 850i / V12 5.0L [M70] / ZF4HP24 E/H

  6. #6
    Join Date
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    Liberal Loontown, CA
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    Cool Volvo, Ugly BMW
    Call me picky, but I always use O-ring lube, comes in a small tube. Not sure if it is exactly the same as vaseline, seems to be clear and little less thick.
    What "thumbs up" really means




  7. #7
    Join Date
    Mar 2010
    Location
    Vancouver, BC
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    632
    My Cars
    1990 BMW 850i, 1976 Nova
    still waiting for a part that goes thru the firewall... apparently after install and pressure test, that piece leaked...
    "...i haven't taken leave of my senses Bob, I've come to them..." -- Ebenezer Scrooge

  8. #8
    Join Date
    Oct 2010
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    Sydney, Australia
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    My Cars
    1997 840Ci
    That would be pipes 2, 3 & 4

  9. #9
    Join Date
    Nov 2005
    Location
    Langley BC Canada
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    91 850 Panzer
    Interesting - those are steel pipes - and go thru a rubber insulator/gasket into the engine bay. No idea why one or more should be leaking. Have done 7 E31 heater cores so far (and another one tomorrow) and have never come across that issue....
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  10. #10
    Join Date
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    +1

    Can't see those pipes with a issue.

  11. #11
    Join Date
    Nov 2008
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    Maryland
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    not enough
    Quote Originally Posted by mjrgroup View Post




    haha...there's ma sekzy grey bucket

    ACtually, when we did Mike's heater core I was pleasantly surprised at how easy it is. I don't think it's as easy if you have a 94+ car since there is another metal beam that gets in the way.
    CB42366 - 1991 850i 6-speed. Brilliantrot & Black Nappa Leather
    CD00144 - 1994 850CSi. Hellrot & Black Nappa Leather


    My other projects:
    Supercharged Tbirds, V8 Tbirds, V8 Mustang Convertible, Audi V8 Quattro & Audi S8

  12. #12
    Join Date
    Oct 2010
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    1997 840Ci
    Quote Originally Posted by CaifanSC View Post
    I don't think it's as easy if you have a 94+ car since there is another metal beam that gets in the way.
    And on a RHD '97, times that x 10 & there are 2 beams. http://forums.bimmerforums.com/forum...Con-leak-found

  13. #13
    Join Date
    Jul 2009
    Location
    Del Mar, CA
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    91 850i, 01 740i, 06 760
    What is the secret to removing the heater core cover?

    My car is a 91 so has the metal bar only on the driver side. I have all the clips removed and the cover is loose but I can't get it out. I'm moving it to the right in hopes of pulling out the left side but just don't seem to be able to move it far enough without hitting the underside of the dash to the left of the lower glove box.

    Beginning to think I should remove the whole dash but my upper glove box won't open (latch doesn't release).

  14. #14
    Join Date
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    Removing the dash makes It much easier to get it right, The first time!

  15. #15
    Join Date
    Nov 2014
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    Fayetteville nc
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    My Cars
    1991 bmw 850i
    Quote Originally Posted by BMSman View Post
    What is the secret to removing the heater core cover?

    My car is a 91 so has the metal bar only on the driver side. I have all the clips removed and the cover is loose but I can't get it out. I'm moving it to the right in hopes of pulling out the left side but just don't seem to be able to move it far enough without hitting the underside of the dash to the left of the lower glove box.

    Beginning to think I should remove the whole dash but my upper glove box won't open (latch doesn't release).
    Im doing mine as we speak and I pushed up from the bottom of the dash and it broke free

    ForumRunner_20150727_225205.png

  16. #16
    Join Date
    Jul 2009
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    91 850i, 01 740i, 06 760
    How did you orient the cover to pull it out?
    I have all the clips removed, the cover is loose so I can move it but I can't figure out how to squeeze it out of there! Does removing the glove box help?

  17. #17
    Join Date
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    91 Dinan860 & 91 850 6sp
    Quote Originally Posted by BMSman View Post
    ...Does removing the glove box help?
    it does.

  18. #18
    Join Date
    Jan 2012
    Location
    Denver, Colorado
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    840ci
    Now I'm seriously wondering with the heater core cover removed, would I be able to move the double din unit to the top?

  19. #19
    Join Date
    Jul 2009
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    Del Mar, CA
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    91 850i, 01 740i, 06 760
    I gave up trying to get the heater core cover off and out through the center console. Ended up removing the dash which must have been replaced at some point since it has a 1995 tag on it and my car is a 91.
    002.JPG009.JPG

    And finally got the heater core cover off.
    006.JPG

    007.JPG

    The only signs of a leak are the white stains on the black pipes.

    The front edge of the ducts in the dash have deformed and was likely the cause of a poor seal. I plan to reinforce this and straighten it out. The foam is disintegrating - I ordered some from Home Depot

    003.jpg
    Last edited by BMSman; 08-09-2015 at 12:36 AM.

  20. #20
    Join Date
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    6.5 second 69 Camaro
    That only sign of a leak is a warning to have a trailer in reach or all Triple A fees paid in full 3 months prior to the Big show,)

  21. #21
    Join Date
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    Quote Originally Posted by BMSman View Post
    ...The only signs of a leak are the white stains on the black pipes....
    and that's all you need to know you need to replace the entire heater core and the black pipes.

  22. #22
    Join Date
    Oct 2010
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    Sydney, Australia
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    1997 840Ci
    Probably should do the A/C Evaporator while you're in there. Murphy's Law says if you don't, you will need to soon.

  23. #23
    Join Date
    Sep 2010
    Location
    San Francisco
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    My Cars
    1991 E31, 1985 E24
    I'm having the same problem as BMSman, in that I have the heater core cover loose, but I canít seem to maneuver it out of the center console area. I also have a í91 with the left metal bar. I had hoped to pull it far enough right to clear the bar and then pull it out, but no matter how I angle the cover, it still hits the right side before it clears the left. If anyone can tell me how to do it without pulling the whole dash I would be grateful.

  24. #24
    Join Date
    Sep 2008
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    Santa Barbara
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    91 Dinan860 & 91 850 6sp
    Take out the glove box

  25. #25
    Join Date
    Sep 2010
    Location
    San Francisco
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    My Cars
    1991 E31, 1985 E24
    I did that, but it doesn't help the cover clear the right side. The cover hits the upper part of the right center console which is part of the dashboard.

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