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Thread: STILL overheating?!

  1. #1
    Join Date
    Jan 2017
    Location
    US
    Posts
    8
    My Cars
    2000 740il

    STILL overheating?!

    We have a 2000 740il. A few weeks ago we cracked the radiator (long story). Soon after, the car started overheating. On my way to work one morning it overheated and I heard a loud pop. The coolant reservoir had blown apart. Since then we have replaced the reservoir, radiator, radiator shroud, t hose, bleeder screws, upper hose, thermostat, and water pump. Yet it's still overheating. It's not showing any of the usual signs of a blown head gasket. Also, we changed the upper hose tonight and when we lifted the hood, we found the old upper hose was flat instead of round, almost like it had been suctioned flat. Based on my research, we will try to bypass the heater tomorrow and see if that works. Any other ideas in case it doesn't? I'm really quite frustrated at this point. Any help at all would be appreciated
    Last edited by Grrrimacloud; 08-11-2018 at 02:22 AM.

  2. #2
    Join Date
    Feb 2015
    Location
    Phoenix, AZ
    Posts
    787
    My Cars
    1997 740iL (5/96 build)
    sounds like air in the system. What is your experience bleeding the infamous e38? they are difficult and there is a very specific procedure.
    The maiden voyage; after a 5 year build got it on the road for first test drive on: 10/7/2017. Still not daily driver.

    My Build Thread: http://www.bimmerforums.com/forum/sh...-Nephews-first


  3. #3
    Join Date
    Jan 2017
    Location
    US
    Posts
    8
    My Cars
    2000 740il
    I knew I was forgetting to mention something, lol. We had the mechanic bleed it before he put the water pump on in hopes maybe that was the culprit. No such luck
    Last edited by Grrrimacloud; 08-11-2018 at 05:49 AM.

  4. #4
    Join Date
    Aug 2015
    Location
    Stockton, Calif.
    Posts
    277
    My Cars
    1999 740Il,1999 Corvette
    A collapsed hose is a sign of low coolant. You have air in the system.
    1999 740IL, 1999 Corvette C5 roadster, 2000 Jaguar XJ8

  5. #5
    Join Date
    Oct 2013
    Location
    Charlottesville, VA
    Posts
    269
    My Cars
    2001 740iL
    +1 on bleeding. I've owned few different BMW models that utilize expansion tank right next to/level with the radiator, and all of them were a hassle to properly bleed the system.
    Current: 2001 740iL Sport (black/black)
    Previous: 2000 528i Sport (black/tan), 1995 318is (black/black), 1991 318is (white/black)

  6. #6
    Join Date
    Nov 2016
    Location
    Hansville, wa
    Posts
    369
    My Cars
    2000 740il
    +2 on bleeding. I was at the track and blew my upper hose. After I repaired it I used Timm's method and had no problems driving home.
    00' 740il Dinan, CAI, Romulus exhaust, Stage 2 engine and transmission tune, 750 brakes, camber plates, strut tower brace. Track monster!
    03' 525i wagon for the wife
    98' 740i for the daughter
    Wrecked, 92' 525i with over 200k, rollover. Wrecked, 02' R1200 CLC, hit by a bus and broken in half. That one made the news!
    It's like herpes there is no cure but if treated properly you can live with it for the rest of your life

  7. #7
    Join Date
    Jul 2018
    Location
    Central TX
    Posts
    132
    My Cars
    2001 740i
    Check underneath the oil filler cap when hot, hows that look? Black?

  8. #8
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    6,708
    My Cars
    99 840ci Sport Indv
    Here's the procedure:

    https://www.meeknet.co.uk/E38/E38_Bl...ing_System.htm

    Also, if you haven't - replace the expansion tank cap - it has a pressure relief valve fitted in it - nothing should pop or explode if that is working correctly
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

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