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M42 Overheating...another one

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  • onesecond
    replied
    Yeah, the new one is installed and it's running cool. Very happy now!

    Leave a comment:


  • jrobie79
    replied
    Originally posted by onesecond View Post
    Well there is a told you so, looks like I got a bad new fan clutch?

    https://www.youtube.com/watch?v=LX923QRA2pE - after a 30 minute drive
    https://www.youtube.com/watch?v=d8e7Dc9hwCU - just after turning it off
    by the looks of the 1st video it's toast

    Leave a comment:


  • onesecond
    replied
    Well there is a told you so, looks like I got a bad new fan clutch?

    https://www.youtube.com/watch?v=LX923QRA2pE - after a 30 minute drive
    https://www.youtube.com/watch?v=d8e7Dc9hwCU - just after turning it off

    Leave a comment:


  • onesecond
    replied
    I'm pretty positive of the leak on the tank as it came pouring out and didn't line up with the leak from the bleed. I will do the test tomorrow for the fan clutch and thanks for the heads up!

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  • roguetoaster
    replied
    A coolant leak at the bottom of the tank can easily be a false positive as the coolant from the bleed screw leaks down there.

    You can drain the system via the blue drain at the base of the radiator expansion tank. If coolant does not come out once the drain is cracked open you will likely need to completely remove the blue screw/drain and jab in the hold with something pointy to clear a blockage.

    Just for fun, do the fan clutch test again and watch the brand new part fail. Basically, even new fan clutches that I have seen do seem to fail even with the engine at full temperature.

    Leave a comment:


  • fresh_TD
    replied
    Originally posted by onesecond View Post
    So I replaced the fan clutch and the issue persists. Tried bleeding the system and the second it bled, it pressurized and a coolant leak happened at the bottom of the expansion tank. Same as seen in the picture in this thread https://www.r3vlimited.com/board/sho...nk+leak+bottom

    Looks like I have an air leak with the tank. Ordered a new one but wanted to know, is there a way to drain just the tank and reuse the coolant (I know I know). Just don't want to do a full flush then realize I have more air leaks in the system and have to keep replacing the coolant
    A "full" flush requires you to drain coolant from block, which you aren't doing. Coolant is cheap enough. Get what you need, to do the job correctly.

    Sent from my Pixel 3 using Tapatalk

    Leave a comment:


  • onesecond
    replied
    So I replaced the fan clutch and the issue persists. Tried bleeding the system and the second it bled, it pressurized and a coolant leak happened at the bottom of the expansion tank. Same as seen in the picture in this thread https://www.r3vlimited.com/board/sho...nk+leak+bottom

    Looks like I have an air leak with the tank. Ordered a new one but wanted to know, is there a way to drain just the tank and reuse the coolant (I know I know). Just don't want to do a full flush then realize I have more air leaks in the system and have to keep replacing the coolant

    Leave a comment:


  • onesecond
    replied
    Thanks!

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  • fresh_TD
    replied
    Originally posted by onesecond View Post
    One more thing before I make an order. The radiator temperature switch doesn't control the fan clutch does it? Just the aux fan?
    Controls the aux fan. The fan clutch is mechanical not electrical.

    Sent from my Pixel 3 using Tapatalk

    Leave a comment:


  • onesecond
    replied
    One more thing before I make an order. The radiator temperature switch doesn't control the fan clutch does it? Just the aux fan?

    Leave a comment:


  • fresh_TD
    replied
    Also look on Amazon and eBay.

    Sent from my Pixel 3 using Tapatalk

    Leave a comment:


  • onesecond
    replied
    https://germanparts.ca/parts/bmw/199...r-fan-hardware ?

    After shipping, brokerage fees and conversion this would still be cheaper :(

    Leave a comment:


  • fresh_TD
    replied
    https://www.fcpeuro.com/products/bmw...tch-3141152101

    Sent from my Pixel 3 using Tapatalk

    Leave a comment:


  • onesecond
    replied
    Ahh brought down to reality, as you called it, it's the fan clutch. Did a magazine/newspaper test this morning and it brought it to a halt. It still spins and will slightly speed up but I guess when it gets really hot, not fast enough.

    Now for the part, there seems to be a ton of options with a wide range in price. Is this a stick to OEM or are the other parts ok to use? BEHR, Sachs?

    Leave a comment:


  • bmwman91
    replied
    A blowing fuse could be a failure in the fan, or a short somewhere in the wiring harness. Honestly, the aux fan should not even be necessary to keep the engine at the right temperature. I ripped out the condenser and everything a decade ago. While you have found an issue, it is not likely to be the issue causing your overheating. As others noted, there is either a blockage in the cooling system, a dead thermostat or a dead main fan clutch.

    Leave a comment:

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