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usally it is because of a cracked vaccume line(hose) from the intake manifold to the dash controls.usally heat makes the line crack-some vaccume canisters develope a crack in them - this will cause the same problem probably the vacum value connected to the vent controls. If there is a broken vacumn line or if the value is bad, it could cause this to happen

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โˆ™ 2004-06-14 08:16:32
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Q: What makes the AC on a 1989 Ford F-150 not blow from the dash vents and only the defroster?
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Related Questions

Where is the headlight on-off light sensor for a Ford F150?

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Why might the heater in a 95 F150 not produce heat through the vents even though all fluids flaps and core work properly?

this is my truck and i have exhausted my options i have also replaced the thermostat. It's not just the dash vents it's also the defroster and floor. The heater cor works fine and the cold/hot cable is still connected on each end and the vent flap works to. please give me some suggestions. E-mail me at thanks

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