FunTwoDrv wrote:
I wonder if you could be dealing with an air lock somewhere in the system...
Gary
My Ford F53 V10 is rock solid on water temp no matter what I do. (Once warm, it never varies in coolant temperature according to the gauge) The fan clutch does engage on some longer hills though. That said, some engines appear to get hot/overheat if there is air trapped in the cooling system around where the water temperature sensor is located. I don't know if that is an issue with the Ford V10 or not. Without an accurate alternate way to check the coolant outlet temp, you won't KNOW either. I'd suggest you find out before you start servicing/replacing parts.
Chum lee