I really liked the idea of the warm weather package that has a solar panel in the sunroof and runs a fan to cool the cabin while the car is parked. My problem: I didn't want to pay for a sunroof or the warm weather package. <br>I would like to buy a solar cell and mount it on the back shelf of my A4 to power the fan. <br>My question: Does anyone know if the regular heating/cooling fan is the one used in <br>the warm weather package or is it another one mounted elsewhere? Where is the solar cell hooked up? What is the power rating required? Any help would be appreciated.<p>

..a unit that you put in the side window (window rolled up to hold it in place). It has solar cells built in and a fan and vent system to circulate air through the cabin. Sounds like this might suit you, no? If I come across it, I'll post here. HTH.<p>CraigB

<ul><li><a href="http://www.acdc-power.com/vent.htm">Solar Car Ventilator</a></li></ul>

The Audi system is pretty complex and the A4 is probably not wired or set up for the mod. It would be big bucks.

It's probably a different fan. Solar cells are not very efficient and you'd probably need one the size of the hood to run the interior fan.<p>There would also probably be problems integrating it with the automatic climate control electronics which control the fan speed.<p>I've seen aftermarket units which fit in a side window. You roll the window up to hold it in place and it has it's own solar cell on the inside facing out the window.