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PINeely · 06-01-2014, 01:12 PM

Probably a pinhole leak in one of the hoses on the water pump/tstat. You won't notice any coolant pooling on the ground because it probably isn't actually leaking until the coolant is warm and the system is pressurized.

06-01-2014, 01:12 PM	#2
PINeely Lieutenant Colonel 1086 Rep 1,912 Posts Drives: 2013 535i, 2015 Tundra 1794 Join Date: Jul 2009 Location: Jackson, MS iTrader: (2)	Probably a pinhole leak in one of the hoses on the water pump/tstat. You won't notice any coolant pooling on the ground because it probably isn't actually leaking until the coolant is warm and the system is pressurized.
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