Leaking coolant from overflow tank
#4
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iTrader: (2)
OR...you have a blown head gasket and the associated piston is pushing air into the cooling system on the compression stroke.
OR........you have a very slow leak or a pinhole leak that is pissing coolant out while you're driving......then when the engine is shut down and cools, air gets sucked in through that small leak. Then after so long, as that air space grows in the cooling system....it can no longer stay cool while your engine is running and the overpressure gets pushed out through the cap and goes into the over flow tank.
Try a new cap.
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#9
Anyone else have a problem with their overfill tank leaking at the seams. I've gone through about 4 of them, whats worse is that it leaks onto the alternator... but somehow my alternator still works..