Quote:
Originally Posted by NastyBlackx5
my coolant has been leaking like crazy. I jerry rigged it together, but still notice puddles under the car. i am freaking out, has any had this issue or any advice?
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I'd been having the same issue with my 2003 4.4i with 60k miles. Over the course of several months the car would eat a gallon or so of coolant. No white smoke, no residue buildup under the hood.
The problem turned out to be a pinhole leak in the plastic tube that wraps around the expansion tank.
I spent weeks isolating the leak. Finally, it got bad enough that I could see it when the thermostat opened, spraying all over side of the expansion tank.
The part that failed is #8 in the attached diagram. The image is copied from realoem.com at:
RealOEM.com BMW E53 X5 4.4i Cooling System Water Hoses