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Old 07-30-2012, 01:58 PM
ArtNJr ArtNJr is offline
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Join Date: Jul 2012
Location: Western N.C.
Age: 61
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Vehicle: 1998.5 Dodge 2500HD 4x4
Trim Level: SLT Laramie
Color: Black
Engine: 1998-1998 359ci (5.9L) Cummins ISB 24-valve Diesel I6 235hp 420lb/ft (manual), 215hp 420lb/ft(auto)
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I'm about 99% sure the system which switches the direction of the air coming from the fan (floor, defrost, etc.) is vacuum operated. There may be a vacuum line loose & even one with a pinhole leak in it will keep the system from working properly. A service manual will help you find where the lines are & how they should be routed. There's even one for the cruise control on my diesel truck & it's a bear to get to, under the driver's side battery!
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