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Keith True · 12-01-2019, 06:05 PM

Warm it up,pull the fan belt off,and rev it up while watching it.It will still circulate by thermosyphon when warm.if you still see bubbles,it is likely something is putting gas in there.If the bubbles stop you could be pulling air in around the water pump shaft,either around the packing or through the grease fitting.I saw one making a froth out of the antifreeze,it was sucking air through the water pump.And,it wasn't even leaking.

12-01-2019, 06:05 PM	#11
Keith True Senior Member Join Date: May 2010 Location: Epping N.H. Posts: 2,989	Re: air bubbles in rad water. Warm it up,pull the fan belt off,and rev it up while watching it.It will still circulate by thermosyphon when warm.if you still see bubbles,it is likely something is putting gas in there.If the bubbles stop you could be pulling air in around the water pump shaft,either around the packing or through the grease fitting.I saw one making a froth out of the antifreeze,it was sucking air through the water pump.And,it wasn't even leaking.