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Why does your air conditioner change from the vents on the dash to your defroster vents when going up a hill?
Wiki User
∙ 12y ago
This is a vacuum issue, as your demand on the engine increases (power to climb the hill) so does the vacuum created by the engine by increased acceleration...this causes the vacuum operated controls in the airbox to switch position.
Wiki User
∙ 12y ago
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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.
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I have exactly the same problem on my 2000 Still looking for the answer
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04' Ford f 350 Only the Defroster works no heater or air conditioner out the vents nothing else?
The first thing that you need to do is check for a vacuum leak for the a/c and heater system, this is a very common.............
How do you adjust office building air conditioner system vents that blow too strong?
change the thermostat setting
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 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.
I have a 2004 Ford Mustang and you will just be riding along and my air conditioner will just randomly start blowing air out of my defrost vents What is going on here?
You have a vacuum leak causing your vents to switch from dash to defrost.
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.
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
