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I have two 2004 cayenne s . One has a problem with instantly fogging up the whole interior after it has been run a while , shut off , and restarted when it is raining. The other one does not have this problem. Do I have a plugged drain some where?

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Check under your carpet for wet. The thick foam padding Porsche used can be soaked and you'll never know it from above. The clue is the symptom you describe..

Get back to us with the location you find the water in - and we may be able to point you to which drain is plugged up..

Edited by deilenberger
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lots of posts on this..

check for wet carpets. esp the front ones. you will need to pull back the carpet and be sure that the carpet padding is dry.

check the subwoofer area for water/dampness.

clean the front cowl drains if you have not done this already..a must on all cayenne

make sure the other drains ..wiper area,sunroof, under the sill in front of the rear wheels, rear hatch, AC drain hole. are all clear.

also will happen if AC has been on and the switched off. but you mention that it occurs after the rains.

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Just because the Recirculation is off doesn't mean the Fresh-Air flapper is open. The little motor that runs it are known to go bad. You need to pull the under floor cover on the Passenger side and push the button while you watch the motor/flapper and see if it is opening and closing. If you have Durametric it will show a code if it is failed also.

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