Question about 2000 Cadillac DeVille

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Vents not working Only blows in defrost mode - 2000 Cadillac DeVille

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Trace any vacuum lines coming from the inside of the car to under the hood sounds like you have a vacuum problem.(hole in a line)

Posted on Apr 23, 2010

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Heat does not blow onto windscreen but blows through other vents - whats wrong


What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !

May 07, 2015 | Cars & Trucks

1 Answer

When i turn the heat on cold air blows out of the heater vents


MODE DOOR NOT SWITCHING FROM AIR TO HEAT IT'S UNDER THE DASH THERE ARE TWO 1 THAT WORKS THE VENTS ONE THAT WORKS THE DOOR FOR THE HEAT AN AIR IF VENTS CHANGE FROM DEFROST TO DASH AN TO FLOOR IT IS THE MODE DOOR actuator

Nov 19, 2013 | 1994 Buick LeSabre

1 Answer

Front defrost


the fsm covers this 100% , why not consult that first.
but check the fuses first, always, for all electric failures.

its all here.
mode control and recirc modes. do the mode motors work?
did you just get car and never here them run, ever?
and not noticing they are now dead?

http://hondatech.info/downloads/Auto/Manuals/Civic/

Sep 10, 2013 | Honda Civic Cars & Trucks

1 Answer

I have a 2006 pt cruiser and the ac works fine but only blows through the top vents (defrost) it dont matter where i put the knob at it only blows through the defrost on top i can turn it to blow through...


If the mode door is vacuum operated, you have a vacuum leak. If it's an electric motor, you have an issue with the motor or controller circuit - or the switch. To properly diagnose you'd need a Tech2 or multiple diagnostic interface and GDS software.

May 12, 2011 | 2006 Chrysler PT Cruiser

1 Answer

2004 trailblazer dash vents fail to blow heat. All other vents work normally. I could not locate a vacuum hose that I thought might operate the upper dash vents. what do you suggest? Thank you.


this vehicle has electronic acuators that move the doors and do not use vacuum. the mode door actuator is bad causing this problem. there is a defrost acuator that works the defrost position and a mode door that works floor/vent operation. the defrost moves and diverts airflow up defrost vwents this is why you can still have defrost and floor.

Mar 09, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Only blowing through defrost vents


defrost is fail safe mode. cehck for a broken vacuum line from the engine to the heater control head. check vacuum reservoir under hood for leaks.

Oct 04, 2009 | 2004 Ford F250

2 Answers

Air blend doors do not work. Air blows from defroster vents


check or loss of vacuum to mode control switch in dash ac control. these are not blend doors, they are air flow control, a blend door controls the air temperature not where it comes out.

Aug 14, 2009 | 2001 Cadillac DeVille

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

Air not blowing out of the vents of my 2003 Dodge Durango


From what I hear it is a vacuum line issue. Mine is doing the exact same thing. So, I am going to get a diagram and try checking the vacuum lines to see if any are loose or tore

I go under the dash and feel the air flowing out the floor and it is coming out of the defrost, also. I noticed under the drivers side today that air is flowing and there seems to be a gap in between a part under there. There was some material stuff I saw around the edge of it that sticky brown stuff and it sometimes before came out my vents all the time. Anyways, not sure if my air is just not sealed good to blow out the vents but it is something that happened not long ago and we've not done anything under our dash area.

Jun 15, 2009 | 1999 Dodge Durango

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