Aircondition ducts problems

[fakafer]

Hi guys, have anyone of you encounterd the aircon ducts nt working? even if i put it in a standard position the air still comes out on top of the dashboard and fogs up my windsheild :o hope theres smethng we can do about it thnx guys :)

[wwest]

Hi guys, have anyone of you encounterd the aircon ducts nt working? even if i put it in a standard position the air still comes out on top of the dashboard and fogs up my windsheild :o hope theres smethng we can do about it thnx guys :)

VW issued a TSB that fixed this for their version of the Cayenne but Porsche insists that "their" climate control is operating properly and "as designed". Porsche also denied, in writing, any commonality between the Touareg climate control and that of the Cayenne. Idiots.

Even back in late '01 the service manager at Barrier Porsche would not even open a work order for mine. He had already seen/heard teh complain many times and knew there was no fix.

They are several posts about this design flaw here and there on the internet. I First noticed the flaw shortly after taking US delivery of our '01 C4. We were approaching Birmingham AL on a hot and HUMID July evening just after dusk, just as darkness was approaching. My forward vision seemed to be declining faster than was appropriate to the approaching darkness and I finally came to the realization that the outside of the windshield was fogging, FOGGED, over and turned on the wipers.

Still had my '99 at the time so when I got home and checked it did the same thing. The last 997 I test drove also did.

Apparently the climate control only opens the system to windshield air outflow once the cabin air temperature declines to within a few degrees of your setpoint. My guess that the design intent was/is to reduce the driver/passenger discomfort level from coolish system airflow directly to your face and upper body by more widely "dispersing" the system airflow. Prior to approaching the cabin setpoint the airflow is likely to be even lower in temperature but at that time the blower speed will also be higher and the engineers may have recognized that exposing the windshield earlier, at that time, to that level of airflow would QUICKLY cause the outside to fog up.

The only suggestion I can offer at this time is to use the same technique everyone else seems to be using. Always remember, religiously so, to use manual over-ride to close the windshield defrost/demist/defog airflow outlet ducts whenever they automatically open in cooling mode.

The practice I use is to depress the button to manually open those ducts and then press it again to "force" it closed.

Rather than a simply "blank" indication, icon, Porsche should modify the climate control display to show when the individual outflow paths are open, not just the anbiguous "blank" or "closed". In automatic mode these indicator icon being blank could mean open or closed.