My ac blows only in the defroster and not any of the other vents i have 98 ford windstar 3.8 v6
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
It sounds like your vacuum controls are stuck on the defroster I had that happen and I sprayed a lubricant into the vacuum lines and it cleared up
Defroster actuator lost vacuume[manual control] or locked up[electronic ATC]....
Either you need to pen your vents or there is some vent obstruction.
Because it's not a defroster button! It's just the symbol for ventilating the air into the car. It shoudln't be called a defroster since defrosting is meant by heating up the coils that you see at the back of the car. I'm pretty no car has wires in the front!
There may be something blocking the deflectors from sending air up there.
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Up against the firewall on the driver side. Look for the small barrel that has a vaccuum line attached to it.
Most temp blend doors have an electric actuator. The defroster, dash vents and floor vents are usually run by vacuum.
some thing is probley cloging the vents take it appart and ckeck.
Check for vacuum leak either under the hood or under the dash Check the operation of the vacuum actuators Check the selector switch Defrost is the default setting on this system
Dont know what the problem is but i can tell you its a vacuum leak . the vents are vacuum operated and require air pressure to change between the vents and floor. the defroster is default setting you may have a vacuum line that has come undone but all i know is its somewhere under the dash.
thats because your blower went out
The air should be comming out of the defroster vents. If so, most likely, it is the vacuum line that controls the vents. It is on top of the engine below the air cleaner, and runs to the front right of the engine. Buy the replacment so you know what your are looking for.
The Heating/ ventilation systems in cars are large structures throughout the dash board, that have many channels of which air can flow through. When you use your face vents, the air is blowing from the upper vent channels. If you use the windshield defroster, the air comes from the very same upper channels, the channels just switch. They have a divider that blocks airflow one way or another. Very much like train tracks, when you change the settings with the switches, the airflow changes because the divider has moved. Therefore you cannot use both at once. The only reason why you can use the foot vents, and face vents at the same time, is because they have a divider that splits the channel that they share, you can use face vents (full force), foot vents (full force) or both split (half force). The Defroster is made to work fast, so if you use the face, and defroster vents at the same time, the defroster would be half as effective. This is why you cant use them both at the same time.
If it blows only out the defroster vents : then check for Vaccume leak Rick ASE L-1 Master TransMichigan.com
heater core is shot and you have to get a new one
its a vacuum line it goes from the belt side at the back and runs behind the engine and down the drivers side and under the battery to the pod under the skirt in the front wheel
ur electronic climate control (ecc) programmer is faulty need to change it and the vaccum harness to the upgraded one. by the way its on the passenger side under the dash.
The 1984 Buick uses vacuum lines to change air flow from defroster to ac vents. Check the entire vacuum system for leaks.
I have exactly the same problem on my 2000 Still looking for the answer
That is actually how the vehicle was designed. If you look at the selector knob for the vents you'll notice that the arrows pointing down and for the windshield are white and the vents for the dash are blue. Basically, you can defrost and warm your feet and that's it