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Why would air come out of the defroster when using the AC-heater but not from the front vents?
Wiki User
∙ 19y ago
Because there is a vaccume leak @ the reservoir or the hoses going 2 the reservoir There is a small,main vaccume hose from the intake manifold that supplies VAC 2 the AC system.The hose is usally 1/8 0r 3/16 in size.Older fords have a tank that looks like a fruit juice can for a reservoir.U have 2 have Engine VAC @ the AC Controls 2 work.If a hose or line is Cracked,the AC will usally blow out the dash only when not under acceleration.when u ACC the air will go 2 the floor.There could even B a hose off under the Dashboard. Some cars or trucks have small rubber hoses or small plastic hoses with rubber conections going 2 the intake manifold.
Glenda, most systems use either mechanical or vacume to operate the vent doors on the airflow ducts. You either have a vacume leak or the mechanical lever needs adjustment. . John In Montana
Wiki User
∙ 8y ago
Wiki User
∙ 19y agoBecause of a vaccume leak or a bad accuator for the blender door. but usally it is a cracked or disconnected vaccume hose - mostly the vac hose from the intake manifold 2 the vac T that goes inside the car.
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some thing is probley cloging the vents take it appart and ckeck.
