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M42 Overheating...another one
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Originally posted by onesecond View PostWell 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
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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
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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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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.
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Originally posted by onesecond View PostSo 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
Sent from my Pixel 3 using Tapatalk
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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
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Originally posted by onesecond View PostOne more thing before I make an order. The radiator temperature switch doesn't control the fan clutch does it? Just the aux fan?
Sent from my Pixel 3 using Tapatalk
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One more thing before I make an order. The radiator temperature switch doesn't control the fan clutch does it? Just the aux fan?
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https://germanparts.ca/parts/bmw/199...r-fan-hardware ?
After shipping, brokerage fees and conversion this would still be cheaper :(
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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?
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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.
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