Page 2 of 2 FirstFirst 12
Results 11 to 17 of 17

Thread: Overheating!

  1. #11
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,749

    Default

    LOL...did anyone mention the bleeding procedure?

    Quote Originally Posted by uscharalph
    It's not the chip (I very much doubt it anyway). You do know how to bleed the cooling system don't you?
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  2. #12

    Default

    What does "bleed" mean?!?! How do you do it?

  3. #13
    Join Date
    Oct 2004
    Posts
    3,395

    Default

    To bleed is to remove air from the system. Air prevents movement of the coolant/water mixure, thereby hindering cooling.

    On the M30, the bleed screw lives at the top of the thermostat housing. It's pretty close to the highest point in the system, hence pretty much where air congregates. When filling a system with fresh coolant (be sure to use BMW Cool Blue, other/generic coolants are suspect), the bleed screw should be cracked open to allow the air to escape. If it's not, air stays in the system. Some air will be in there (maybe even trapped in the thermostat cover) regardless, which is why it needs to be bled out with the car running. With the expansion tank full and the cap off, start the car and open the bleed screw. Close it when a steady stream of fluid comes out, no air. Actuate the throttle and look in the expansion tank -- check for a steady stream of coolant returning via the pisser. No stream? Bleed some more, actuate the throttle some more. Don't overrev a cold engine -- keep it somewhere below 3k rpm. Once it's pissing, close the expansion tank and start driving the car/watch the temp gauge. An 88 degree tstat should keep the gauge at 12o. If the gauge goes above that, pull over immediately and bleed it -- if air comes out, get it all out. If coolant comes out and not air, shut off the car -- there's some other problem.

    Also, the heat should be on high/full blast throughout the entire procedure.

    Also, there's a good chance that the tstat itself, among other things, is fried if the car has been overheated.

    The M30 isn't hard to bleed. I used to think it was a major pain in the ass.

    best, whit
    Last edited by Kalevera; 10-29-2005 at 05:49 PM.

  4. #14

    Default

    Crap...my mechanic put in generic coolant, I think it's blue though. Should I drain it? Also, just to double check, by "expansion tank," you mean the tank where you actually pour in the coolant, right? Does anyone have a picture of a pisser?

    Thank you so much

  5. #15
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,749

    Default

    the pisser goes from the expansion tank forward to the radiator.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  6. #16
    Join Date
    Mar 2005
    Location
    Long Beach, CA
    Posts
    2,563

    Default

    "expansion tank," you mean the tank where you actually pour in the coolant, right?

    That's it!

    Ralph Mendoza Jr. - Long Beach, CA

  7. #17

    Default

    Thanks a lot guys. I very busy during the week but I'll try to bleed it during the weekend and tell you how that goes!

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Overheating?! Not Again!!!
    By ///Sniper535 in forum 5 Series BMW
    Replies: 22
    Last Post: 07-23-2007, 10:53 AM
  2. Is your M50 overheating ?
    By shogun in forum 5 Series BMW
    Replies: 3
    Last Post: 06-13-2007, 01:13 AM
  3. Overheating
    By uginer in forum 5 Series BMW
    Replies: 4
    Last Post: 12-25-2006, 12:39 AM
  4. car overheating, need help
    By misfortune in forum 5 Series BMW
    Replies: 10
    Last Post: 11-26-2006, 12:34 AM
  5. overheating
    By blaze12 in forum 5 Series BMW
    Replies: 7
    Last Post: 07-09-2004, 09:59 AM

Posting Permissions

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