Cooled front windshield glass/Thermal glass

[deutsch100]

I'm having the exact same problem on my 4.8i, as in the 750Li. When the temperature goes above 80F (27C), or even if it is somewhat cool outside, yet the car is parked in the sun, or driving in direct, strong sunlight...there is an enormous amount of heat generated around/behind the front windshield/screen glass. It is like being in a greenhouse.

I called my dealership yesterday and complained, and they asked for my VIN#. They called me back, and informed me that I do not have option code "355", which is front thermal/cooled glass. WTF? It's not even on the BMW website, for Build Your Own...nor is it in the borchure for both the 2007 and 2008 X5.

Does anyone know what this is, and can we have the windscreen changed? Those who must endure hot summers, will know what I am talking about. The radiated heat is unbearable.

Thanks!