Snow screen

[Sol]

it takes me around 10 miles before I get full heat. After 5 miles the coolant temp is still 60-70 and very little heat is produced. As JJ says, the screen is not easily controlled from inside if it starts to overheat. Modern diesels are very efficient and cold runners unless working hard.

I do remember seeing a vehicle with a thermo controlled blind on the rad but I think it was a Merc or a Jag, not sure if that is something you can get aftermarket.