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While the wife is in the field teaching the little ones about nature, nature leaves lots of presents. Leaves and debris.
This is something you want to consider because clogged cowl drains will raise the water level to a point that water can enter the cabin and make its way to things that are electrical (boxes and wiring).
The 958 cowl drain access is different than previous models. Using my preferred maintenance method , I plan on doing this at least once a year, if not more.
There are two maintenance methods:
1. Partial release of the wheel liner mounting screws and nut (My preferred)
2. Full release of the wheel liner from its screws, two nuts, and complete removal of the liner.
Tools:
1. Jack, Jack stand or equivalent, and wheel removal and fitment tools
2. 10mm socket
3. T25 bit
4. Favorite socket wrench or hand electric drive (my preferred)
5. flat head screw driver
6. Garden hose (NO PRESSURE WASHER)
The ac drains are lower if i recall. The cowl drains are much higher. Some recommend not reinstalling the rubber piece pictured but since there is an opening in the wheel well to the engine compartment no sense inviting heat and engine compartment smells into the cabin and electrics in the cowls. JMHO.
Thanks CAVU. Will have to try it this weekend. How you are supposed to do a good job cleaning under the cowls with all the stuff they crammed in there is beyond me
Mine spends almost no time under trees and when I pulled the cowl covers both sides are packed full of debris
So PSA to all those (like me) that think theirs are going to be clean as it doesn't see many trees: pull the cowl covers and look, you too might be shocked!
Really nice description. Is there any way to do this with pressurized air, say once a month, to avoid the build up (recognizing that you probably need to do the thorough cleanout first)?
Really nice description. Is there any way to do this with pressurized air, say once a month, to avoid the build up (recognizing that you probably need to do the thorough cleanout first)?
Based upon my experience I would not use compressed air to clean the cowl out. However, I might be inclined to use it to loosen things up a bit followed by the water to push things out.
Today using this post I tackled the cowl drain clean out. I chose to remove the rear of the fender liner and was able to turn the wheel in to get to the required rear fasteners of the liner. The drains were pretty clear but I chose to remove both of the cowl drains and snipped off the AC condensate drain flapper valve. UPDATE: To get to AC condensate drain I had to drop the plastic under tray.
Left to right are the driver's cowl drain, AC condensate flapper and passenger's cowl drain:
Last edited by r553; 07-22-2017 at 07:37 PM.
Reason: corrected access to AC condensate drain
Getting added to the 958 DIY forum.. thanks much for the very informative write up of something almost everyone who owns a Cayenne will have to face sooner or later.
05-21-2017, 01:35 PM
958 Cowl Drain Clean Out - DIY
