The other night I pulled my Cayenne into the garage to swap the bad driveshaft in it. The car had set for 5 days under heavy rain somedays. I shut the vehicle off and the cooling fans kept running. over 7 minutes before I disconnected the negative on the battery. Upon doing some research I found that people are having issues at about my mileage range (I am at 72868) with the coolant temp sensors. I understand there are two of them on the V8 models? The part is cheap, and I want to DIY this and get it over with.


1) where can I find the radiator fan temp sensor / switch?
2) upon reconnecting the batt cable and bringing it back out into the driveway, i noticed the PSM fault light is on... is this normal and will it go off after restarting again?




-----------
UPDATE

upon acquiring an all-data subscription I have noticed there is a coolant temp sensor for the computer and a radiator fan temp sensor / switch. given the guage is displaying the correct temp, am I to assume the coolant temp sensor is fine and it is the radiator fan temp sensor / switch?

best,
Lance

 

Hello Lance, and all here.
I have the same symptoms and wanna know the awesome results you had????!?!


Fans run great on hot engine temp, gauge reads accurate range, iCarSoft AcR PRO+ reads 40-60c warming up (ok) and all fuse boxes get power.

​​​​​​Putting HVAC settings on (low low) and blower high gets no AC compressor engagement, no cooling fans. Power to compressor. Bought 2 new fans and controllers, but couldn't get them to activate testing with VCDS or turn with hot temps, while original fanset was able to- so originals stayed.

Wanting to piggyback my VCDS cable with (Porsche mod pin 3, 7, 15) y-cable, and rescan. iCarSoft will read engine and transmission modules but says no communication from controller for HVAC.

I just can't believe this will be due to an inside air temp sensor combo, door flap combo or similar - as there seems to be no noticeable flappy issues or codes pulled for these systems ever....

​​​​​​Aloha from sweatsville Hawaii