You can usually
Find the leaks by starting on a cold car, fill the reservoir to the max, and let it warm up to operating temp.
squeeze the hoses, they should be pressurized
get a flash light and a dentist's mirror and start looking for a pisser that leaks only under operating temp.
If you are using the BMW blue stuff it leaves a residue at the site if the leak that looks like light blue crust.
Don't forget to checkout satan's water hose
Good luck & happy hunting
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