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how do i keep expansion tank full?

i have 2001 c5 . i have prolem with expansion tank . have replaced but still loseing water (about 2-3 ltrs every 100 mls)
also tried replaceing pressure cap twice.
not leaking any where else only around cap/tank area

clowesy65
December 2007
ChevroletChevrolet C5Vehicles, CarsKeep Tank Full
It sounds like your C5 has excess pressure in the cooling system, if the coolant is still spewing out if you've replaced the cap. I would suspect cylinder head gasket problems which would cause this. Ask a capable garage to 'sniff' the air above the coolant with a gas tester - this immediately shows if there are any gasket leaks. Water pump leaks also aren't unknown on these.

John
December 2007

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