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2005 Cayenne Turbo Interior Temperature Sensor

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Does anyone know where the interior temperature sensors are located?  And why there is a wire harness running to some of the vents (like the center vent for example)?


I'm attempting to troubleshoot an AC issue, and I've noticed when I open the windows and let a bunch of hot air in, I can feel the vents start to put out much colder air.


Compressor was changed by the previous owner a couple of years ago, refrigerant level is also good.

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  • 1 month later...

Will the Durametric tool be able to read those sensors?  Sometimes I can feel it get ice cold for a few minutes, and then it levels off and gets kind of a cool "humid" breeze.  There is a service record of the AC compresor being replaced about a year before I purchased it, but this blowing of humid air is terrible.   I have checked the rubber drain hose that runs from the housing to the firewall, it's clear and open, and the hole in the housing is clear and open as well as the firewall dump..



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I just replaced the center vent in my '03 CTT and there are what are called "blowing out sensors" in the center vent.  I had already bought the part because the plastic dividers were broken, but before I replaced it, I started getting different temperature air from the left and right sides when the L/R temp settings were identical.  The problem resolved itself with the center vent replacement, so I assume it actually had a bad sensor.


The best piece of advice I can give for the overall "Cayenne Experience" is to buy a Porsche Service Manual online.  They're all over the internet anywhere from free to about $15 for the PDF download.  Best investment I made related to home repair and troubleshooting.  The attached wiring diagram is from the 'WIRING' section which is 100+ wiring diagrams.  The one I have is 60+ separate files totaling thousands of pages.


Good luck!

center vent.jpg

AC wiring.jpg

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