Heidi993

Hi Danish - I can't help with the Porsche to VW conversion, however if you know which actuator needs replacing, take it off and the VW part number is printed in the centre of the arm. All the actuators are the same, it's just the length and shape of the arms which are different so the part number is printed on there. We found this out after doing loads of research and cross referencing between the Porsche and VW parts department. After ordering the correct one, we noticed the VW part number in the arm!!! Hope this helps. Heidi ?

We recently serviced and replaced some motors on the HVAC, On the passenger side, behind the glovebox was this. Can anyone tell us what it is and what it does? It seems to have a printed circuit on it???

Thank you Rod, and thanks again for everyone's help, The new motor is in place, and everything is working fine. No more frosty air on my feet, and the Cayenne is once more a pleasure to drive ? We live in the north, and winter is coming, But it doesn't matter as my feet are toasty now!!!

Hi Rod, yes, here's where we are. We got all the motors off the car. On the plate with the top set of three motors, for some reason on one of them there were two of the three screws missing on one motor, and one from one of the other motors. So we assume that might be why the demister wasn't working, as the motor is working, and the motor was turning instead of moving the flaps. Below that on the second plate, we only have one motor not two. We confirmed this with Porsche, there isn't a footwell flap, only a mixer flap, which was the main problem initially (cold air onto my feet). so we tested that motor and it didn't work. we opened it and cleaned it, and it turned out it was working. a new one from porsche was £170, and from VW £140. So we gave the original one a try. Back fitted to the car it was pumping out hot air to the footwell, so we put everything back. After driving a few miles the air turned cold. When tried later, it started hot again. This morning it was pumping out cold air, than when i parked up and tried again it got warm, not hot. So, we think, It is this motor that is at fault. It is an intermittent fault, and as it is the mixer motor, sometimes it is hot air, sometimes cold air, sometimes it is warm. And we are most likely going to order a motor from VW and replace it. Does that sound correct? My partner said after doing it once, it is far easier to do the second time, so even though a few hours, it's not too traumatic (for him)

So - here's where we are now, We have the lower two on the left hand side, passenger side. We have the bottom one on the right hand side removed, and are within sight of removing the the three on the top on the right hand side. (after removing the foot brake etc.) and a couple more questions>> On the right hand side, the drivers side (both sides actually) there are supposed to be two servos at the bottom. However, we have found on the drivers side there is only one. Anyone shed any light on this? We have opened one, to see whats going on inside. Does anyone (Rod?) know which of the pins to attach 12V to move the arms without opening them? and, does anyone with a RHD know which servos relate to the VW ones. We are most likely going to buy new (after this experience!!!) as second hand ones might be on their way out.. All the servos look like they are the same basic part, with different arms on the back - is this correct? Each servo looks to have a different ref number stamped on the back - like this one with TS, is this the way we would identify them?

Ok. so update on the servo saga. This is, in the words of my partner, by far the most 'challenging' automotive task ever. He has been doing the majority of the work, but i have been in there removing any screws he can't reach (of which there are many). See the evidence!!!

This could be a problem!!

I just found this on a toureg thread: "I was also getting tired of hearing all the clicking that was happening behind my dash so I too disassembled my dash this fall. Top and bottom. Once I tore apart the dash and really started looking at how things go together I noticed one significant thing. It's actually not necessary to take it apart. The flap motors are assembled in a set, on metal brackets. Once the motors are in the park position using the VAG-COM, you loosen two screws on each bracket that face down towards the floor of your vehicle and the whole "set" slides down and out. They are guided into place by two guide pins/screws. You can see these pin/screws on some of Redubbed's pictures. For example, the driver side has one bracket with three motors and one with two motors. With some patience you can actually remove all the flap motors with only the panels under the dash removed. I've tried. After I replaced one motor another started acting up and I didn't want to pull everything apart again so I pulled the driver side under-dash panel out, removed the two bracket screws and slid the bracket out. Removed the motor from the plate. Replaced it. Slid it back into place." https://www.clubtouareg.com/forums/f73/hvac-flap-motor-replacement-dash-removal-185361-2.html However, Bekks, much as your post makes me optimistic, i'm not sure it will be possible for us. As this post explains, we have the parking brake right up against the transmission tunnel, which is under E and D ? It's late but I'll pop out and get a quick photo! Now on RHD cars the right hand servo's are boxed in by the foot brake mechanism and holder (not a problem in LHD cars). see http://www.specialistvehiclepreparations.com/blog/porsche-cayenne-heater-flap-replacement I pondered this for a while as the above article says you have to remove the dash bar (which is basically impossible-I tried for about an hour to figure it out, but I couldn't budge it).

The images were the right way up. Here is a photo of the near and the far servo, on the passenger (left) side. I'll get some photos of the ones on the other side tomorrow, Heidi

Bekks - hopefully this image will make sense. We used the abcde one you were referring to - and the other one on this thread showing their exploded location. i have had to mirror it so it makes sense to me, but it does now. I think you are correct, that the three we can see and have posted videos of are - in the diagram - #13 (the easy one) #12 the one working fine #11 the one working but with issues. unfortunately this means the one that is most likely the issue, 'D' is on the drivers side. We (when I say we, it isn't so much me) have removed the trim etc on the drivers side, where A,B,C,D and E (1,2,4,7&8) are. D and E are visible, but unbelievable buried. A,B & C are somewhere above those - we know roughly where via the diagram, but can not see it being possible to even see them.. Similarly, 15 and 16 on the other side, we can only estimate their position ? Rod, we just read your blog a third time. I know you said you did it, and we do believe you, But it looks virtually impossible to remove either any of the servos on the drivers side, let alone all of them on a plate. And we can only see D and E. When I say see, its a contortion to just see them. If we weren't talking to you about this, we would never believe it was possible. Do you think, with hindsight, the removal of the dash might be a better, and maybe even quicker option?? Thanks for all your help so far ?

just in case anyone has a different model, here are the buttons we are talking about. (i can't post an image :?) https://www.dropbox.com/s/ptqqqcexruhedry/2018_09_06_cayenne_heater_smaller.jpg?dl=0 I hope these make sense to the people who have had theirs out and wonder if anyone (Bekks?) can tell us: 1 - Is this the mixing servo? 2 - how would this restrict the warm air to the drivers side, as although it is a bit shakey in its operation, it does eventually open, and eventually close??? 3 - do we need to remove anything else to remove this motor? we can get a bit onto the screws, and turns them, very very slowly. thanks Heidi

Video #3 so this one look a likely candidate. this motor is operated by the windscreen defrost button. https://photos.app.goo.gl/QCYbC6VQj1jN4Jqf7 It looks difficult to get to, and a nightmare to put back in. on the video, we switched the defrost button on, you can hear it, and it struggled to activate itself. When we turned it off, it took quite a while to go back to the start position. We turned the video off probably about 30 seconds before it came to a final rest, as my partner thought it had finished.

Video #2 This is the second motor we can see. It is a little more buried, but not too bad. It's difficult to get to, but accessible. This controls the up arrow - air to windscreen https://photos.app.goo.gl/zqCdTychcQ7g1uVu7 this seems to be working fine. again on the video it was switched on then off.

Hopefully this works ok - please can someone let me know if you can see these? Video #1 Stripped out the left hand side - the passenger side, and can see three motors. This is the first one, low down and by far the easiest to get to. https://photos.app.goo.gl/Rr9hYFqXKDatwKoz6 It seems to be operating correctly, and kicks in when the air recirculation/fresh air button is pressed. On the video it was switched on, then off.

I know this is an old topic - but i am having problems, My CCU is not working full stop. It is dead. I plan to remove it soon to see if I can fix it, but in the meantime, here are a couple of related links: https://rennlist.com/forums/964-1989-1994-911/687307-ccu-button-replacement.html https://www.bergvillfx.com/ccurepair https://rennlist.com/forums/993-forum/950555-hvac-unit-dead-trouble-shooting-check-list.html