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958 Cayenne DIY: Blower motor replacement

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958 Cayenne DIY: Blower motor replacement

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Old 12-21-2017, 09:08 PM
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ktr6
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Update. My new blower motor arrived last night and I managed to install today. Happy to report that my HVAC system is back up and running like it was before and the fault code the durametric was reading has cleared. The job itself was not that bad just required some research on what needed to be removed etc.

Things I learned:
  • Blower motor failures in earlier Cayennes seem to be quite common. It can either be due to a bad external resistor/regulator (which can be replaced) or the blower itself-good DIY on Pelican for the older model range. Failure is less common in 958s and our unit is all one piece (blower plus resistor).
  • Cost for a new unit for the 958 ranges from mid 200s up to 500ish depending on brand and where you purchase. I found a genuine OEM unit for $320 with free shipping and pulled the trigger.
  • While you are in there I would plan on replacing your cabin air filter and making sure your HVAC water drain tube isn't clogged as mine had been (I blew some compressed air through it). I was amazed at the amount of dirt on the filter-guessing mine had never been changed.
Here are the steps I took:
  1. Remove the two passenger dash vents. I used two small flat head screwdrivers to release the tabs inside the vent. Shine a flashlight inside the vent and you will seem them. The vent near the door will require you to remove the plastic fuse cover and remove the two torx screws (T15 I think).
  2. Open the glove box and remove the trim piece above the glove box door, I was able to do this by hand. Once the trim piece is gone you will see the Torx screws for the top of the glove box.
  3. I then turned my attention to the plastic piece below the glove box. There is a single Torx screw to remove and it simply pulls down by hand. I went ahead and removed the electrical connections to the 12V adaptor and the footwell light to get it out of the way.
  4. Remove the plastic footwell air distribution tube, you will now have access to your cabin air filter to change it out.
  5. Back to glovebox, remove the screws that were under the dash trim piece (top of glovebox, along with two screws the bottom of the glovebox. Remove electrical connections. My glovebox came out as a unit after sliding it down and out.
  6. At this point I went ahead and unclamped the rubber water drain hose that runs to the firewall from the AC unit. I had a gush of water fall into the cabin and blew some compressed air into the hose (towards the firewall) to try and clear it. I poured some water through and it drained our underneath the car so hoping that means my drain is open.
  7. You should be able to see the blower motor at this point. Remove the main electrical connector to the front of the unit. Next if you look at the back towards the firewall you will see a red wire that runs along the back of the blower, simply pull it down and push it out of the way.
  8. There is a metal bracket that is blocking the blower from being being unbolted and slid out but fear not as the blower drops down to the floor when being removed. If you look underneath you will see 8 screws in a vertical orientation. Remove these and save them. The unit should now pull downward and forward and can be removed. The blower itself mounts to a bottom cover/bracket, pull the old unit out and put your new blower in. Reinstall is the opposite of what you just did.
Plan on a couple of hours for the job, if you have basic DIY skills this is a very reasonable job. I hope this can help someone else in the future if they encounter a problem like I did. Good luck.
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