Finally found and solved the wet carpet problem.
Without my normal waffle – it was the drain tube from the Air Conditioning. This is a rubber hose with a semi-sealed end with a cut/slit or burper opening. The end was blocked, or had sealed itself shut, apparently a common problem with older Cayennes that have heavy AC use. So, after driving around with aircon running, the cold condensation builds up and has no where to drain to. It sits in a little overflow tank until it finally fills up and floods out on drivers (and passengers feet) when cornering. Sound familiar? If so, then this video will help fix it.
It’s a simple job – one screw look for the hose, found it, opened it, sprayed some lube (WD40) to stop it sticking shut again and *boom* aircon is properly draining and no more wet carpet.
Wet carpet on drivers side?
The story so far – I had a drip-drip-drip onto my drivers side carpet. I didnt think too much about it. Until the car died with a massive electrical brain fart which turned out to be caused by the gradual buildup of moisture under the carpet. This moisture eventually corroded some wires hiding down there and caused an electrical nightmare.
This is my first try at fixing it – which didnt solve the dripping carpet problem but did find and unblock some other water drain holes. Definitely something I would recommend to any Cayenne owner – it’s easy and just took a few minutes to do:
After a bit of trial and error — I finally solved the wet floor mat problem. Mine was caused by a blocked AC OVERFLOW VALVE but my first attempt at finding it (this video) was cleaning the other drainage holes. It’s a quick easy fix so check it out here https://www.motolimey.com/solving-the-wet-cayenne-carpet-conundrum/
Need to do 2 things (1) clear the rubber draining holes and (2) clear the air-conditioning evap tube (next video)
or in the words of the Donald… “drain that swamp”