Question about 1991 Mercury Cougar

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AC PROBLEM MY AC SWITCHES FROM THE FRONT VENTS TO DEFROST VENTS BY ITSELF WHEN ACCELERATE

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Check for a vacuum leak bewteen the engine and the heater box control.

Posted on Dec 17, 2008

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My Winshield Defrost Quit Working. Heater, AC, and vents all working except the windshield defrost.


I'd have to check actuator movement for defrost. The actuator is electric according to my database. The actuator should be under dash at end of hvac housing.

Dec 10, 2015 | 1989 Chevrolet C1500

1 Answer

Does the Erg vacuum solenoid cause the ac switching from vents to defrost


the ERG shouldn't have anything to do with what vents the AC comes out of, rather the dash switch that exists for changing from defrost to main vents to floor vents controls what vents are used.

Jun 07, 2015 | AC Cars & Trucks

1 Answer

AC


go to www. aa1car.com and get the topics and fix it.

God bless you

Jul 18, 2013 | 2000 Ford Expedition

1 Answer

AC is only blowing through the defrost vents in the dashboard?


I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

Jul 26, 2012 | 2003 Chevrolet Tahoe

1 Answer

Ac and heat blowing out of defrost vents


had this problem on a ford crown vic ... tried the switches that control the vents not it ... turned out that one of the vent doors inside of heating and ac/ ducts was broke .... had to take the whole dash apart to fix ... u need to have it checked by a respectible mechanic ... depends on ur yr and make of car on how to diagnose problem ...

Jan 02, 2012 | Cars & Trucks

1 Answer

I turn the ac on and it works fine, but when I accelerate instead of the air coming out of the front vents it automatically switches to the defrost vents, and when i decelerate it goes back to the fornt...


The only way to solve those type of problems
because of the extensive electronics,is to use
a professional scan tool to access that system
your having issues with

Unfortunately there is little a vehicle owner can do
at home any more. Even the pros are barely able
to even know where to start

Personnally I think they would need trouble chart
to follow

I will encourage you to avoid a dealer,unless your buying
a vehicle or getting free warrantee work. Never go there
ever. Too expensive & the results especial at Lincoln is
terrible. They won't even look at the issue until they sell
you all kinds of services & you have been there 3 times

May 26, 2011 | 2003 Lincoln Navigator

1 Answer

1997 explorer max ac switches between front and defroster vents


Check the vacuum hose going to the heater control valve,it may have popped off. If that is on. check the vacuum hose going to your recirculation door under the right side of your dash. I hope this helps.

Jun 09, 2009 | 1997 Ford Explorer AWD

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

2 Answers

Loss of a/c air through front vents


You have a vacuum leak. Engine vacuum is used to move the doors that control airflow for the heat and ac.

Aug 27, 2008 | 2000 Dodge Ram 1500 Truck

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