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there is a good chance the main vacuum supply line from the engine that feeds the HVAC system is broken or disconnected. Inspect the vacuum lines under the hood.
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∙ 15y ago
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Why is air coming through the AC vents instead of the defroster vents on a 1995 Buick Skylark?
There may be something blocking the deflectors from sending air up there.
On a1996 corvette what causes the AC air to blow out of the defroster and floor vents for about 30 minutes before blowing out of the dash vents?
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Why do you get hot air at floor and defroster vents but only cold air at the dash vents vents in a 1995 chevyvan 20?
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
Why would air only blow out the floor vents and the two outside dash vents not out the center dash vents or the defroster no matter what setting the Heat and air controls are on in a 2003 Ford Taurus?
some thing is probley cloging the vents take it appart and ckeck.
What causes air to blow out the floor and defroster vents but not out the panel ac vents on a 1997 firebird?
How easy is it to replace head gasket on 1994 firebird lt1 motor
You have no heat coming out of the vents but do have heat at the floor and defroster on a 95 Plymouth neon 2.0liter 5 speed sohc?
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.
Why would the vents in your 1999 Suburban blow air through the defroster but not through the dash?
thats because your blower went out
1984 buick air conditioner only blows out the defrost vents?
The 1984 Buick uses vacuum lines to change air flow from defroster to ac vents. Check the entire vacuum system for leaks.
How do you fix your ac to blow in the correct vents and not just the defroster?
My ac blows only in the defroster and not any of the other vents i have 98 ford windstar 3.8 v6
What is a mode door on a 2000 Dodge Intrepid?
I think your refering to the door in the heater housing that directs air to vents, floor or defroster vents, there is also a blend actuator that mixes heated or cooled air to give the correct temperature from the selector.
Why does the air conditioner on a 2002 Crown Victoria blow out of the defroster and on the floor but not the dash vents?
I have exactly the same problem on my 2000 Still looking for the answer
Why won't cars let you select the Face vents and defrost vents at the same time?
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.
