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1999 Ford F-250 Super Duty Question: a/c heator wont wont blow air of vents
Answer #1raiderron March 09, 2011, 18:58Master
If problem is intermittent then could be a vacuum servo that controls blend door operation, if remove glove box then look at servo linkages and see if bleed off when it does it. Sometimes the controller in dash will have vacuum problems as well.
Answer #2DaveJHM March 10, 2011, 02:52Master
Naturally - also look for disconnected or damaged vacuum hoses.