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E46 Cooling System DIY

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Hallo all,

I heard and read that the E46 cooling system is kind of "weak". If water is disappearing from my radiator and I can't see any leaks, does it mean that I might be losing the water at high speeds and it "hides" again when I stop? I looked under the car and it seems like there are run marks (water tracks) on the LH side of the sump.

Also, if the water is going into one of the combustion chambers it will cause bad and uneven running or a severe misfire, or won't it? I already checked, it is not going into the oil, because it still looks like oil, not dirty milk.

Thanks in advance.

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