Originally Posted by
Michael Larson
The expansion tank could be water logged and rendered ineffective.
Originally Posted by
Chad Fabry
I'd bet Michael's right about that.
I agree with Chad, I think Michael has it right.
*IF* the expansion tanks were working properly, they should be able to handle the thermo-expansion, if there is anything wrong with them (water logged, deflated, low pressure, high pressure, whatever) then they will not work 'well', they might work 'somewhat', but maybe not enough.