2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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It's pretty normal. Every single car I've ever owned had this happen in one way or another. I had a friend with a 96 Z71 truck that blew hot air through the floor vents horribly, which he called his "free heat" lol. I honestly think it comes from aging seals or mechanisms on the blend doors, which would explain why max A/C would temporarily alleviate the problem (recirculation mode, blend door shut). You're doing better than my co-worker, his windshield freezes from the inside in the winter, and no combination of climate settings on the dash can fix it as long as the truck is moving - and it's a 2011 model lol.
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I am super **** about everything in my Mustang.
when the AC isn't on, i close the vents.
when the vents are closed they all must be perfectly horizontal.
in my honda civic, warm air comes in too. unless i switch the vents to circulate instead of outside air.
that is just like what another post said about switching to max AC for a second, then turn it off.
Max AC is recirculating the cabin air and closes the outside air vent.
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