SOURCE: heat only blows out of dash vents, will not blow out of defroster
vvacum leak. in back of your temp control unit there is a series of vaum lines attached together they might even be in different colors these lines go to the vent and they open and close them when you slide the lever over this piece needs to be replaced
SOURCE: Heat wont blow through heater or defroster vents
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
SOURCE: Air is blowing out of defroster and floor but not main dash vents
Check for vacuum hose leak.
SOURCE: The heater/air conditioner fan diverter on my 2003
Either the "MODE" control cable has come loose from the actuator pivot connection, or the MODE door inside the air box is broken.
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