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  1. #1
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    Help!! What could this mean?

    1998 528i with 121,000 miles.

    Yesterday I pull my car out of the garage last night,I let it warm up I began talking with my neighbor for about 10 minutes. I then notice the temperature gauge is moveing past the center mark and making it's way over to the overheating mark. So I said let me get it moving and see what happens. I this point dail is all the way over to the right and the overheat light comes on. I am near a main highway so I said let me see what happens as I drive a bit being it's about 54 degrees out. I am moving about 50 miles an hour and in no time the temp goes back to normal. So now I go back to the house and park and let the car run to see what happens, nothing at all stays fine. Today no issues either. I had a simular thing happen some years back where the coolent system had to be bled due to air, but it hasn't been touched since. What the hell could this be?

    Thanks!


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    Stuck t-stat? Did U check coolant level when cold?






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  3. #3
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    Re: Stuck t-stat? Did U check coolant level when cold?

    Today I did before I started it, it was full.

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    When it was showing an overheating condition did(

    you happen to turn on the cabin heater to see if you had heat? No heat would indicate air in the system.
    Also did you happen to notice if your aux fan was running? It should have turned on long before the temp needle got to the red.

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    if you turned off the a/c then the aux fan may not

    start and if you have any other trouble - thermostat, air in system, etc. it will overheat.
    make sure to turn on the a/c and check the aux fan next time.



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    Re: When it was showing an overheating condition did(

    yes I had heat.. I Also didn't if aux fan was running. Excuse me if I sound stupid but is the aux the same fan that comes on when running the AC?

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    Re: if you turned off the a/c then the aux fan may not

    how many fans are in this car, 2? when I turn on my AC there should be another fans always running? I know in the summer from using the AC when its really hot, there is a fan which is real loud that will kick on and off. Never had any trouble this past summer when the AC was running.

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    The aux fan is the one in front of the radiator (m

    It will turn on when you turn the AC on. It will also turn itself on when the AC is off it the coolant temp gets too hot. Yes it is loud and you should have noticed it when the car was overheating in your driveway. Yours should be a 3 speed fan with the resistors that burn out. Eurodavid had a nice post a few months ago showing how to replace these resistors.

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    Re: The aux fan is the one in front of the radiator (m

    I have to check this.. It didn't come on today when I turned on the AC. I will need to double check it. Do you have that post from eurodavid?

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    Also: faulty waterpump

    Water pumps (among other parts) on BMW cooling systems are maintenance parts. Replace every 6 years or 60,000mls to be on the safe (preventive) side. While you are at it, replace the thermostat as well; it is known to stick. Ask me how I know.

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    These I6's are prone to cylinder head damage...

    if over heated. I strongly advise that you find & fix the cause of this overheat condition before driving the car again. At 121k miles, it is due for a complete cooling system PM if it hasn't been done already (WP, t-stat, all hoses, exp tank, & maybe radiator).
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    Don't forget the fan clutch

    It's cheaper than all the other gear and only after replacing mine did the new head and cooling system parts stop over heating on my '97 528i.

    If your cooling system is not leaking I recommend to start with the fan clutch replacement.

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    Not to be...

    ...smart or ignorant, but did you check the coolant level? That bottle can become kind of discolored and it can be hard to check the level of the coolant without actually looking inside the bottle. The same thing happened to me and after I topped off the resevoir with a coolant/water mix, all has been fine. BUT, I still need to find where the coolant is going (if it is a leak). This happens maybe once or twice a year.

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    Re: These I6's are prone to cylinder head damage...

    Also, overheating is the primary cause of radiator/expansion tank failure - they may be next.

    Keith
    2001 530i 5sp

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    Re: Not to be...

    I only check the level by looking at the bottle. Iwill open the cap and take a look.

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    Re: if you turned off the a/c then the aux fan may not

    I check my aux fan today. I turn on my AC which was blowing cold, and check the fan, it was not on. Is this fan always suppose to run when the AC is on? Throught the summer months running the AC I had no problems at all,

    I would hear the fan kick on & off during the summer while running the AC, but it never stayed on all the time. The fan is very loud (as im sure you guys know) so you can't miss it not running. I never had a problem with the car overheating during the summer and we had a Hot summer here in NY this year.

  17. #17
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    Jim Cash could we get your input here....


  18. #18
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    Steve, seeing your Aux fan isn't working this (m)

    needs to be fixed to prevent overheating. When you are driving the car there is enough airflow to keep the radiator cool enough to prevent the engine from overheating.
    I didn't find the link to Eurodavid's resistor replacement post. The resistors are mounted on the aux fan frame IIRC.
    Here are the schematics for the 3 different speeds and how they are controlled. The relays are in the DME box. Your fan should come on when the AC is turned on.




  19. #19
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    JimLev how come I never had

    an overheating problem in the summer. The fan has always worked like this (at least for me). When running the AC during the summer it never turned on exactly when I turned on the AC. At times I would here the fan kick on for a while (mostly in stop and go traffic) and then kick off.

    It would always do this, the car never overheated and we have a hot summer here in NY. From what you telling me sounds like I have problems. Funny thing I let the car sit for about 15 min yesterday running, Aux fan never came on nor did the car overheat the temp never moved from the center mark. This is really driving me nuts....

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    Yes | No

    Replace the fan clutch - it pulls the air when hot

    If the car over heats again feel for heaps of air movement under the front wheel arches and I mean heaps of air. With my replaced fan clutch I could feel the wind blast on my legs. This amount of air movement through the area of the radiator will keep the coolant at the required temperature, Klaus in Munich obviously did the sums.

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