Heat is not supposed to come from the center vents, only cool air. I noticed weak foot area heating in mine this morning. Maybe its typical for these cars, or the vac element is broken for that particular flap?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma