Well, picked the car up last week from the harbor and drove it 300miles home over the autobahn.

I got stuck in a traffic jam and after some time standing still the temperature started sky rocking towards the red zone. In order to prevent it from overheating I put the heater on max and the temperature went back down to normal. I had to keep the heater on all the time whilst not moving in order to prevent the car from overheating ( not the most pleasant experience to be honest) . As soon as I drove, the temperature went back down to normal and I could turn the heater off.

Outside temp. was around 75°F. When I drive it now in city traffic the temperature does not rise at all.....

Did my fan go bad? I can still turn it with my hand and there are no codes. Is there a way to re-produce the circumstances in which the fan normally has to come on? Like having the a/c on its maximum setting whilst standing still?

Does this sound like the typical fan failure??

Thanks!