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· Registered
2002 330i, 2000 323i
1,074 Posts
Here is an easy way to discover the leak(s), rent a coolant pressure tester from any of the parts stores such as OReilley or AutoZone. Use it with the engine cold (it's easier and safer this way). Pump it up to about 15 lbs and look for the leak as your pressure gauge should also drop pressure.
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