Question about 2004 Ford F350
The vents default to defrost as a safety precaution when there is no vacuum. The only things that I can think of that this could be are the vacuum motor or a vacuum leak. If its the vacuum motor you will also have 4X4 and vacuum assisted brake booster issues(unless you have a Hydro Boost system). If its a vacuum leak its possible that you have a cracked vacuum reservoir(located on the passenger side fender I believe), a disconnected vacuum line, or a damaged vacuum line.
Posted on Mar 25, 2011
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Posted on Jan 02, 2017
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