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Member
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Join Date: Dec 2013
Location: WI
Posts: 230
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Member
Join Date: Dec 2013
Location: WI
Posts: 230
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I have no experience with the problem on 4Runners but I have experienced it with other vehicles. There is a flap in the dash that is controlled by vacuum valve that is supposed to move to direct the flow of air. Besides that, there is also often foam used as a gasket on the flap to seal out air from going where it's not supposed to.
A common problem on all older vehicles is that the foam disintegrates and the vehicle develops a vacuum leak so the flap doesn't do it's job properly.
It's something you either live with or tear apart the dash to fix.
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2006 Toyota 4Runner, SR5 Sport package, 4.7L V8, 4WD
Mods - HCF delete, fog light mod, Gibson stainless catback, K&N air filter
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