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Cold air coming through dash, passenger side..01 F-150

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Is there a fix to this?? Every ford that I have had has had this problem. (97 f-150, 02 expedition, and now 01 Supercrew) Every winter I get the complaint from my wife on trips that her feet are cold and that cold air is coming in behind the glove box. I have sat in that passenger seat and man, the cold air does really come through there. Is there anything to look for or any fixes to this problem?

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Pull the glove box out, then go down the road and look in the area to see if the cold air/outside air door is closed.

If the heater box has ever been out for a heater core, I have seen the insulation get kinked, or rolled, and not seal, just silicone it where it is leaking around the case.

I dont remember the years, but on the passenger side, there is louvers where the heat comes out of the ducts, you could take a carpenters knife, and cut out the louvers, so more heat blows on to the passenger floor.

The cab vent is behind the passenger seat, on the back of the cab, cold air will refresh into the cab, and since cold air sinks, it will flow along the floor on the passenger side, right up to the front seat. Determine if the cold air is coming from the front, or back. If it is coming from under the passenger seat, place something under the passenger seat (back passenger seat if it is a S/C) and have it redirect the air from blowing directly on to the front passenger feet area.

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