Question about 1991 Chevrolet S-10 Blazer

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The ac only blows out the top(defrost) and floor at the same time. it want blow out the front vents. Whats the problem and how to fix it?

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The problem is that the control is vacum operated,so either the rotary vacum switch is bad or you have a vacum leak under the hood or under the dash area.

Posted on Aug 05, 2010

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How can I fix my ac to blow out my top vents

Posted on Jun 05, 2013

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1 Answer

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

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These will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

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 vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

1 Answer

My ac only blows from defrost and floor vents.nothing blows from the front vents.


Look for vacuum leaks. System is designed to fail in defrost mode. so.... vac hose off, for example, would cause an issue like you describe.

Jun 30, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

1993 ford e-150 conversion van heat and a/c


Selection lever does not move to AC vent or floor vent only to the defrost. AC compressor does not kick in when AC is selected.
Vacuum level is at 18 instead of 23.
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Oct 19, 2009 | 1993 Ford Econoline

1 Answer

2003 dodge durango front AC vents not working


had this trouble in a dakota it was a blend door in the heater unit. had to remove entire dash to repair

Aug 10, 2009 | 1999 Dodge Durango

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

1 Answer

1998 Mustang - AC blows only through Defrost vents


You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Jan 05, 2009 | 1998 Ford Mustang

1 Answer

Dash Vents wont blow as selected


THE COMPRESSOR IS SUPOST TO RUN NOT MATTER IF IS IN HOT OR IN COLD MODE SOME TIME THERE IS A POSITION WHERE THE A/C WILL BE OFF AND THIS IS ON THE KNOB CONTROL WHERE YOU SET DEFROST AR FT VENTS
ALSO ON THE THE SWITCHING FROM DASH TO FLOOR CHECK FOR ANY VACIUM LEAKS FROM THE ENGINE COMPARMENT SINCE MOST OF TIMES THIS IS CONTROLED BY VACIUM ACTUATORS

Jun 01, 2008 | 1995 Chevrolet Tahoe

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