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BUBBLING IN RADIATOR WR250F


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WR250F 2001

I had coolant leaking from water pump weep hole so replaced w/pump seal and no more leak. However after refilling coolant and burping air out of system I notice there is now bubbling in the radiator that increases when revs increase. It would seem to point to head gasket but before I pull the head off I'm wondering if there is anything it could be apart from blown head gasket? Thanks

Edited by PJNZ
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Yeah, probably a head gasket. The leaking head gasket made the failing WP seal fail 'more'. Use a cooling system pressure tester and a stethoscope at the spark plug hole to listen for hissing, unless you have a bore scope to visually see the leak. A leak down tester will, also work, it'll loose pressure and you will see bubbles in the radiator.

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Thanks for the feedback. If it was just coolant circulating then the amount of bubbling wouldn't increase so noticeably with higher revs would it?
 

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