Hello - thanks for that - yes all of those settings work ok - but all only at low speed. And all of them used to work a faster speeds too.

In general I keep it off auto as I don't like a load of fan noise - so it's generally on a manual setting - floor and screen. Ive tried changing all the settings on various longer trips - end up with the same outcome. More than 5 min above 50 or so MPH - heating blows cool.

Its had recently a new waterpump, caps, thermostats, heater valve. The engine temp remains completely static and it warms up nicely. It's never overheated since I bought it August 2017.

What would be your more complicated things to look at!? :-)