A/C question
07-23-2018, 12:48 PM
#16
Advanced
Sounds like there is something wrong. I had an incident last year during the summer time when I had to have some warranty work performed on my 2011 CS, the drivers side fan switch was not working correctly. They fixed the switch problem and since I had my English bulldog with us, I turned the AC on max cool. My wife and I drove off and the AC decided to not work. The fan was blowing but it was not blowing cool air. U-turn! We drove in and they immediately got a technician on it and he hooked up a PIWIS. They reset the cooling system and it was great after the reset. Here is the kicker. My SA told me that the system is working correctly. The AC system will stop blowing cool air when the system starts to get to hot. It will continue to blow air but the cooling system will stop the refrigeration process in order to cool down the system. I can attest to this because I was driving up the Grapevine (aka. Tejon Pass) on the I5. It is a 6% grade for about five miles. In the summer heat, the cooling system is taxed hard. I was about 2/3s up the hill when the AC stopped blowing cool air while I was driving at a modest 80 mph. After driving for another 5 minutes after cresting the hill, the cooling system had recovered and the AC started blowing cool air again. So, maybe your system needs a reset and possibly your AC monitoring system is not working correctly. Just my two cents.
07-25-2018, 12:40 AM
#17
Rennlist Member
Many thanks to Don for this handy tip
07-26-2018, 12:36 PM
#18
07-27-2018, 11:24 AM
#20
I had the same AC problem in my 2011 958. The AC hadn't kept the vehicle cool for years. Last month I followed the process described by deilenberger and the AC was instantly fixed. In addition to the felt tape, while the vent was out, I stuffed a piece of foam rubber in the gap between the vent and the back of the red sensor.
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But one thing that did make a difference for me was leaving the recirculating air button on. Was talking to a Cayenne owner about this and he mentioned that its a 'Porsche thing' that you can select the recirculating button on and it will stay on if you stop and re-start the car. I cant think of another car that does this, but Porsches do! So keep the recirculating button on, set the right temp and airflow and make sure the sensor isn't getting fooled - then it works much better.