11-03-21, 06:57 PM
(11-03-21, 04:34 PM)teecee90 link Wrote: Presumably the valve within the cap could fail but the upper seal remain intact? That could presumably result in no leakage from the radiator cap but 'blow off' of excess coolant through the valve at a lower pressure than specification. The excess going into the expansion tank and ultimately out through the overflow if enough of it?
On the gen1 the cap is not just a cap, it is also a valve (with a specified pressure rating). Not sure about the Gen 2 though....
Anything is possible, that said I've never seen fill cap fail in that way. If the seal on the filler cap fails, it will leak coolant, the system will over heat as the system can't pressurise, it wont go up the expansion pipe, as it will take the path of least resistance i.e. out of the filler port. If coolant is blown out of the expansion tank, the system was/is either over filled and/or the system is blocked somewhere, water pump has failed and the engine is now boiling it's self.
Later