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bubbles in expansion tank

Transit Mk6 & Mk7 Forum. All Transits 2000 - 2013

Re: bubbles in expansion tank

Postby Frag » Sat Mar 28, 2020 11:07 am

If it’s not overheating,pressurising or loosing coolant,leave it alone !

The bubbles your seeing could be remnants of air in system from when you’ve changed the stat....
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Re: bubbles in expansion tank

Postby C & S direct » Sat Mar 28, 2020 4:03 pm

Places with water connections which could cause pressure from engine running.

Block cracked, very unlikely.
Head gasket going, cream in head around oil filter cap neck.
EGR, if water cooled.
Oil cooler, passing any signs of oil in water?
Water system leak.

Pressure test the coolant system first off
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