Repair guides and support for the fourth generation of Ford Mustang, including the Mustang GT and Mustang Cobra.

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Ac vents don't blow comes out defroster

When a.c. is on it will only come out the def or floor that it other that that it works fine

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Hi Robbydanny, that problem happens when there is an issue with the vacuum system. I would suggest popping the hood and looking at the vacuum lines for any cracks or leaks. Replace the lines that are damaged and if you can, swap out the hard plastic lines for flexible rubber vacuum rated hose.

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