The switch should be close the the wiperm motor but I think you need to dismantle a lot of stuff to be able to reach it.
So your car (alhambra?) stays also cold when driving 50 - 70 km/h when it's freezing outside then?
When driving 120 km/h for a while the temperature goes up to 90°. But when standing still with running engine the temp is dropping fast again. You have this also?
pete
January 2010