Another heater question folks.
Flushed the system recently, by that I mean I undid the tap at the bottom of the radiator and let water flow until it stopped, then pushed water back on until it filled the tank up again. Repeat. Just driving today, all good, hot air, and then suddenly it turned to cold. The tank is still full to it's full mark, the large hose from the right of the radiator to the engine (as you stand and look into the bonnet) is hot, and the left side small pipe from the tank is warn but not either of the other two, and the water in the tank is cold. Temp gauge says fine. It's getting dark and I'm far from home, should I be worried about killing my engine?