Welcome to RennTech.org Community, Guest
There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.
Here are some of the features available - once you register at RennTech.org
- View Classified Ads
- DIY Tutorials
- Porsche TSB Listings (limited)
- VIN Decoder
- Special Offers
OBD II P-Codes
- Paint Codes
- Videos System
- View Reviews
- and get rid of this welcome message
It takes just a few minutes to register, and it's FREE
Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)
- No ads - advertisements are removed
- Access the Contributors Only Forum
- Contributing Members Only Downloads
- Send attachments with PMs
- All image/file storage limits are substantially increased for all Contributing Members
- Option Codes Lookup
- VIN Option Lookups (limited)
Just some words of experience or wisdom for you. I have had A/C issues for 1 1/2 to 2 years now. Neither the Porsche dealer or a local indy A/C guy could figure it out. Dealer did a scan and swapped the A/C control unit, I did some servo motor work etc. My intermittent issues: 1) freon blow off 2) warmer on passenger side 3) Never super cool on the driver side 4) Coolant temperature slightly warmer I decided to replace the compressor. The indy A/C guy insisted I replace the A/C dryer as well. Upon removing the dryer he found that the dryer failed. Most of the particles in the dryer clogged at the bottom of the dryer and some leaked out into the condensor. They tried blowing out the condensor and put everything back together but I still had the same issues. They felt from that point that the condensor was clogged and not getting an even flow of freon. They replaced the condensor (front bumper and many other parts have to come off). Results: A/C is ICE COLD, no more freon blow off, cold on passenger side, coolant temperature not showing as hot. ******REPLACING YOUR DRYER WILL ELIMINATE GOING THROUGH ALL OF THIS HEADACHE***********
My 2004 Cayenne S emblem was looking worn out, so instead of replacing it with the original I decided to see how the new PORSCHE emblem would look. I am pleased with the results, a nice change for $37.00.
Just a quick update. I replaced the switch and it solved my a/c and fan issues. It seems that my condensor fan was coming on intermittently and causing the a/c to build pressure and blow off freon. The job is not difficult if you have done the coolant pipe replacement. You have to remove most of the same parts. One HUGE help was that I had a 22 mm O2 sensor remover (it attaches to the end of the ratchet). It fit right over the sensor after the connector was removed. Prepare for some coolant to come out so be ready to plug it with a finger or have the new sensor ready.
Lauren, I have to replace my bank one sensor. Can you also send me a PM? Thanks!
I had an indy shop replace the a/c fill valve with a new brass one. I had 1 more freon blow off right after that but nothing since. I don't know if the fill valve replacement worked or if the fan just fixed itself. I no longer have an A/C or fan/temperature problem?
Thanks for the PDF! I will replace it this weekend and see what happens. I guess there is only 1?
I was hoping someone could send me the a diagram location of the coolant temp sensors, and or sensors for the fans.
It's easy to adjust if you're handy . When you open the glass you will notice the square shaped latch on the left and a pin on the right. The pin on the right controls the rear wiper. The left square shaped latch is what you want to adjust. 1. Pull off the plastic cover that surrounds the area. You will notice a nut that holds the square shaped latch tight. 2. Loosen that and try rotating the square latch 1/2 turn to the left or 180 degrees and re-tighten the nut. 3. Re-close the glass and see if it grabs and turns off the light. I just had this problem and my initial thought was to tighten the latch bolt (to the right) to draw the glass closer but the light actually needs the bolt longer (to the left) which helps it push that catch mechanism completely and turn the light off. 4. You may need to adjust it a few times or rotate it a complete 360 degrees until you get it right.
The dealer could not find any faults and said they were able to operate the fans. I know it's running hotter than normal and I can see the temp rise when I know the fans SHOULD be kicking on that's why I think I should trace down what is or isn't triggering the fans but more important the high speed fan.
I have seen different parts of this topic but none that addressed an intermittent problem. I have been having A/C and coolant temperature problems for a while now. Both the dealer and very reputable Indy A/C shop cannot seem to find out what is going on. My fans work but after much research I am convinced that they are not going on when needed. My temp is going over the typical 180 mark by about 30 to 40 degrees when at idle. If I do not turn the econ button on when at idle and the temp rises (occasionally) I will get freon blow off at the compressor. Would I be wrong to start checking the coolant temperature sensors or any other fan sensors. I found a thread on the boxter that jumps the relay but it seems the cayenne does not have the same relay set up. Coolant is good and full I installed a new coolant reservoir tank (per the dealers recommendation) Coolant pipes done 2 -3 years ago New water pump Thanks, Craig
I drained front diff this weekend. Very little fluid drained out! No wonder why it was making noise. The lack of fluid I am sure didn't help my diff problem. I also had to grind 1/4 inch off of my allen wrench to clear the piece that was in the way. I would reccomend doing this MUCH sooner (50 or 60K). I have 120k miles 2004 CS
Question: I have the noisey differential problem and wanted to change the fluid to see if it helps. I see you removed the top drain screw. Did you have to remove the bottom to drain as well? Please tell me the difference between the bottom and top tubes. I would guess the top tube you are filling the diff back up but what are you doing with the bottom tube? And as vicary asked: fluid, amount and cost? Thanks
Update. I replaced the coolant res tank. No change in the AC (as expected). I replaced the driver and passanger temperature servos (at least the system isn't confused). FYI, the old servos are made in spain. The new ones are swiss. I have an AC guy looking to see if I have an intermitent fan problem. Can anyone tell me the freon capacity of the system for an 04 CS with NO rear air? It seems the sticker I should have under the hood is not there and the dealer could not confirm the level but thought it was 2.2lbs. Thanks!
It was evacuated by a proffessional A/C tech and refilled to the proper spec (pounds of freon). It runs fine and cold but with no warning it will blow off. The ONLY thing I find not right is that the system gets warmer while driving 40+ MPH and colder when stopped.
Update: I replaced a cracked reservoir tank. The coolant temperature is back to normal (a tick over 180). I am in the middle of replacing the temperature mixing servos (I will update that post for anyone attempting a diy). I had the freon topped off but had another blow out tonight. My question is, is there anything in the unit that the servos control that can cause the freon to build pressure? Is there something else that might cause pressure to build? Thanks