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What causes the ac to only blow from the defrost vents on a 94 Buick century?
Wiki User
∙ 14y ago
There are a couple of possibilities. The vent diverters are either physically stuck in the duct work or the diverter motion has been stopped by losing a power source. The diverter is the vane within the duct that changes the location/direction of the fan controlled air movement in the vehicle cockpit... whether it's providing heat or air conditioning. The power loss could be the electrical wiring, fusing, motor or the solenoid providing the positioning of the vane. Another possibility is the "defrost" selection or button is always on or enabled. I hope this will help you in determining the problem. WBT
Wiki User
∙ 14y ago
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Selector only stays on defrosted 92 buick?
If the heat selector will not switch from defrost to the dash or foot vents on a 1992 Buick, it is possible that the cable connected to the vent is broken. When the selector is moved from defrost, a cable opens the other selected vents on the heater.
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.
Why AC won't blow out of dash vents just defrost vents in a 1996 buick regal?
on your car it is a defalt mode for air to blow out defrost when there is no vacumn from the engine so you should look for a broken vacum line or see if it has come unplugged on the engine.
What causes the front air conditioner on 1999 Lincoln navigator to stop blowing through the ac vents and start blowing through the defrost vents?
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
Why does 2000 Buick Lesabre Custom Air Conditioner blow only through defrost vents?
The vacuum supply line from the engine is disconnected or broken. When the vacuum supply is cut off the system defaults to the defrost mode.
What causes the air conditioner on a 2003 Chevy trailblazer to stop blowing through the ac vents and start blowing through floor and defrost vents?
Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position
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 the dash vents work on my 1995 Chevy Camaro but floor vents and defrost vent work fine?
When there is a problem with the vent system it dfaults to the defrost setting. Sounds like you have a problem in the doors that direct the air flow.
Why heat blows out vents only not defrost or floor?
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
Why does Air conditioner work on defrost only and no front vents or floor?
Vacuum leak
04 Chevy trailblazer why don't defrost and floor vents work but not face vents?
The mode door actuator has failed. We have instructions for repair at www.trailvoy.com
Why does your trucks defrost vents start smoking?
That's probably steam from a leaky heater core.
