Hi,
I have a problem with cabin heater.
The engine warms up quickly after start, stays at the right temperature, no overheating problem at all. Cabin heating works if I’m driving slowly in city traffic but the hot air cools down if I’m driving 70-80mhp.
Last time I drove 30-40 min. in a freeway not having heating at all. Close to the office at the stop light while I was standing it started blow the hot air.
If I’m moving fast I have no heating, if I’m driving slow I have hot air.
I might be important that I have replaced the radiator in the beginning of the summer, but I haven’t used the heating on freeway, just in slow traffic where it is fine.
The car is ’95 530i, M60 engine.

Thanks
Zoltan