> So why would the car ...cruising down the highway
> start ejecting water out the overflow bottle?
> Enough so that it started spurting out the little
> lid breather hole and 'geyser-ing' against the underside
> of the bonnet. (water all over the place near the bottle)
Did you by any chance fill the overflow bottle full, with the engine cold ?
It needs to be almost empty when cold, to have room for expansion.
Other possibilities :
1) Radiator is partially blocked internally, such that the water pump can
build enough head against the restriction to blow water past the cap.
2) You have a compression leak into the water jacket, ie a leaking head
gasket or a crack somewhere, that isn't big enough to show up on a
compression check.
Randall
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