Question about 1993 Ford Econoline
Air diverter doors are vacuum operated. This problem is generally due to broken vacuum line. Start tracing the vacuum line from entry at the firewall back to engine. Likely goes through some type of canister, especially ball shaped and maybe through a vacuum manifold where several lines attach. Check for leak along all attaching lines all the way to vacuum source at engine manifold. If no problem found then check line from firewall to temp/climate control switches under dashboard and from switch to actuators. Can sometimes be difficult to trace but never impossible. Good luck!
Posted on Jun 22, 2009
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Posted on Jan 02, 2017
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