Question about 2004 Ford Super Duty F 450
Hi, sounds like a vacuum problem. When you select from floor to vent to defrost, the system uses vacuum from the engine to change over. If you look under the hood, near the firewall, towards the center, there should be small rubber vacuum lines. Check these lines for leaks with the engine on by spraying soapy water on the lines. If you see bubbles forming on any of the vacuum lines, this is where the leak is. Also check the vacuum lines going to the climate control unit inside the vehicle.
Posted on Jul 27, 2009
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Posted on Jan 02, 2017
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