The A/C control knob doesn't work anymore--the air only comes out of the defrost/dash area. How do I fix this?

Asked by TGibbons27 Sep 16, 2016 at 08:15 AM about the Ford F-350

Question type: Maintenance & Repair

2005 F-350--Diesel

1 Answer
61,205

Andrew answered 8 years ago

Does temp and fan speed still work? The vents are vacuum controlled. Your truck has a vacuum motor on the passenger fenderwell. Make sure it is working and can build vacuum. If it can build vacuum find the leak. Most commonly it's related to the 4x4 hubs, which are also vacuum operated or something disconnected due to recent work.

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