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coolant

  1. Thermostat/water pump issue

    General E46 Forum
    I just bought my 325i and when i plugged in my scan tool while driving I noticed that my engine was at 99C and my radiator was at 27C. I tried to bleed the system with some distilled water just to see if that was the issue but I don't believe that it is. The radiator stayed stone cold the...
  2. White smoke coming from back of engine bay/Coolant Leak

    General E46 Forum
    So for the past month my car has been leaking coolant pretty fast and im currently just refilling as i figure out what to fix. I notice that when my coolant level is low my car starts to smoke and the smoke seems to come from the back of the engine bay on the washer fluid side. The smoke seems...
  3. Coolant Temp Alarm using cheap ebay OBDii Gauge

    General E46 Forum
    We all know the E46 cooling system can be a bit fragile, and overheating from a failure can cause irreversible engine damage. We also know that the gauge in the instrument cluster is not a regular gauge, with the needle pointing unwaveringly to 12 o'clock for the entire 75-115C range. Beyond...
  4. Coolant Recommendations?

    ///M3 Forum
    Hi everyone, what coolant do you all use for e46 M3? My level is a bit low, and while I know I could just top-off with distilled water, I'm looking to get some coolant anyway for the future. Thanks
  5. Strange coolant issue

    General E46 Forum
    Hi all, I’ve got a 2002 M3 but I’m posting in the general forum as the same thing could maybe happen with any model. So the issue. The car has been in storage for a couple of months but I needed it about a fortnight ago. All was good when I put it away and it started and drove fine when I got...
  6. Help my hurting '04 325xi please

    General E46 Forum
    Hey everyone, I'm new here and finally have a chance to say hi :-) So for starters I have a 2004 325xi with 191K miles on a 5 speed 2.5L L6, and she is starting to hurt. There is a coolant leak, not bad yet, but there's a 2"-3" spot under the center front of where the motor is when I park...
  7. No coolant flow to heater core, not the control valve

    General E46 Forum
    Hello, I come to you all with a desperate plea. I have absolutely no clue what is wrong with my E46 right now. (2003 325xi) It has no heat in the cabin. I first tried to see if the ac worked, which it did. Then the heater core control valve, which was fine. Flushed the core, and it was...
  8. Transmission Oil Cooler

    General E46 Forum
    I got a new coolant tank bracket and fan because my fan got ripped to pieces on the freeway and broke the bracket but not the tank, also I got a new oil cooler sensor. Come to find the transmission cooler does not seat on the fittings, it is a crappy doorman product from autozone. Anyone run...
  9. Low Coolant light on, need help

    General E46 Forum
    Hey so i finally got my E46, and my low coolant light randomly lights when driving, and sometimes disappear when driving. I filled the expansion tank with distilled water, around 350ml. (it's on max now) and my car is consistent 12 o'clock when driving (i'm not overheating) but the light...
  10. Pre road trip question. Boston, MA to Raleigh, NC

    General E46 Forum
    Hi everyone, Next month I will be moving from Boston, MA to Raleigh, NC and will be driving my 2005 325i for the 700ish mile / 11 hour trip. I was hoping to get some advice on any general preparations I should do for the car. I plan to get an oil change in the next week or so. In the last two...
  11. Coolant Temperature Rapidly Changing

    General E46 Forum
    A few months ago I had a little scare with overheating. It turns out one of the coolant lines was loose and resulted in coolant leaking out. Everything was fixed but ever since then I've made a note to turn on my obc to the coolant temperature to keep a closer eye on it, which brings us to this...
  12. White Smoke From Exhaust

    General E46 Forum
    Hi All, I'm new to E46 ownership, I picked up a 2000 323ci with 83k a few weeks ago. The car has good service history but hasn't been driven much at all since 2007 (about 2-3k miles a year) I've noticed that when the engine is warm there is white smoke coming from the exhaust, it's only very...
  13. Coolant hose blew of after coolant system overhaul.

    General E46 Forum
    Once again I need advice from this awesome place. I just did an overhaul of my cooling system on a BMW e46 320i Touring -02 Manual Transmission List of what I changed: - Thermostat (Mahle) - Radiator (Hella/Behr) - Water pump (Meyer) - Expansion tank (Meyer) - Plate between radiator and...
  14. Bad headgasket/cracked block: leakdown #s good, but leaks into expansion tank

    General E46 Forum
    I am looking at a friend's 2003 325i (Oct 2002 build date) with 170k miles that has been losing coolant without any external leak and also suffering from intermittent cold start misfires (INPA codes 239, 240, 241, 242, 243; and P1347/P1349 type codes on obdfusion). This car was overheated after...
  15. Help overheating

    DIY: Do It Yourself
    I have a 00 328ci my engine is over heating... and leaking coolant.. the reason this all started is the fan wasn’t plugged in the sensor got unplugged and it over heated and exploded on the side of the road... coolant was everywhere. Since then I bought a new expansion tank and expansion tank...
  16. Help overheating

    General E46 Forum
    I have a 00 328ci my engine is over heating... and leaking coolant.. the reason this all started is the fan wasn’t plugged in the sensor got unplugged and it over heated and exploded on the side of the road... coolant was everywhere. Since then I bought a new expansion tank and expansion tank...
  17. warning light - coolant

    General E46 Forum
    Hi all, the warning light for my coolant comes on (yellow) periodically , stays on for a short time then goes off. I check the levels and its completely full and the coolant seems fine. Also sometimes the warning lights for my rear lights come on too (not the same time as coolant light) then go...
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  20. 2004 BMW 330CI cooling issues

    General E46 Forum
    Hey! This is my first post but I'm gonna try keep this all pretty straight forward. So a few months ago I finally got my Bimmer up, running, and saftied. I realized that my low coolant light was on so went to add coolant but I realized my radiator cap had actually split in 2 pieces, one of the...
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