Had an issue with the cooling system over pressuring on my 1998' v6 CDX estate which today culminated with a pipe splitting and coolant raining out the bottom of the engine bay. I know there can't be a blockage anywhere as just done all top end engine gaskets new radiator new condenser new stat and full system flush and everything was fine. Heard a rumor that the heater bypass valve may be to blame something about if it fails in can cause over pressurizing. Am I on the right track with that one ?????. Secondly my heater works great except it will only blow into footwells it won't switch to any other vents like the windscreen or centre vents. It's a climate control model with digital temperature settings could it be the heater actuator valve or summat like that. Any help will be much appreciated.