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Old 12-02-2009, 03:43 PM   #25 (permalink)
DonR
Master EcoModder
 
Join Date: Mar 2009
Location: Northeast Ohio
Posts: 269

The Wife's Hot Rod - '09 Pontiac G8 GT
Last 3: 23.22 mpg (US)

Big Outback - '13 Subaru Outback 2.5i

Little Outback - '02 Subaru Impreza Outback Sport
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Make sure your cabin air filter is clean.

For those of you with Cabin air filters. A clogged filter can cause more internal fogging problems than a clean filter. I would believe that it reduces the natural flow of air through the cabin from the pressure differantial.

My sister had this problem, not realizing she had a cabin air filter. She replaced it & has very little fog anymore.

Don
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