Question about 2003 Lincoln Navigator

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Ac jump from vents to defroster what cause that to happen

What cause A/C unit to jump from vents to defroster

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Could be a vacuum leak, or a faulty EATC ( Electronic Automatic Temperature Control) Module. Ford is notorious for these problems, but I mainly know because my 07 Cafillac CTS had the same issue. First the mechanic checked the vacuum lines to make sure they were holding pressure, then discovered it was the EATC module going bad. Mine was under warranty, so I don't recall if he said what prices were.

Posted on Jul 16, 2014


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