Question about 2004 Dodge Ram 2500

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Air flow through the vents inside truck will not change in air velocity or from defrost to mid section or foot section

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Vaccum hose off under hood or at vac canister on fire wall

Posted on Jun 20, 2009

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My windows are not defrosting properly.


Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.

Feb 20, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Why is hvac air coming from all three locations (vent/floor/defrost) regardless of switch setting?


Check air box if it won't change air flow some thing is wrong there inside the car

Jul 14, 2014 | 2000 Buick Regal LS

1 Answer

Heater and Defroster not blowing air


check vent flaps inside the blower unit....

Nov 24, 2013 | 1996 Mitsubishi Mirage

2 Answers

Ac is blowing out of defrosterandnot panels in the dash. Air is cool cold air will blow out of rear seat panel/vent 1998 ford explored


The most common cause is a bad blend door actuator which controls air flow throughout the cabin. When air flow only flows from 1 section (either floor, vent, or defrost) it's an indication that the blend door actuator is either stuck or broken.

Jun 02, 2011 | 1998 Ford Explorer

1 Answer

Air flow to defrost or floor not switching stays on dash vents


cannot switch from defrost to panel airflow 2001 chevy silverado

Oct 06, 2009 | 2001 Chevrolet Silverado

1 Answer

Air flow to defrost


your heater,defrost control modular needs to be tested for funtionallity

Oct 06, 2009 | 2001 Chevrolet Silverado

1 Answer

Air flow thru defrost and floor vents,but not dash vents.


It sounds like one of the flaps that control air flow is stuck, you have a vacuum line leaking or disconnected, or the vacuum actuator is defective. Look up under the dash to see if anything is out of the ordinary. Look for any hoses hanging down that might have gotten snagged by someone's foot and gotten pulled loose. Hope this helped you and good luck.

Jul 21, 2009 | 2002 Cadillac Eldorado

1 Answer

The Air flows through only the defrost and feet vents


Inside the ventilation system there is gates that open and close to direct the air flow. These are operated on vacuum on most vehicles. The hose for that perticular gate may have disconnected somehow or has a hole in it. I suggest you take the heater controls out and see if there is a plug with a series of colored hoses on it. it so you'll have to trace each of them to see which one is the problem. Now you may be able to get some help from you local dealers mechanic who just may know the color code for that gate. (which would be a bonus) Good Luck

May 28, 2009 | 2004 Oldsmobile Alero

1 Answer

No air flow from defrost vent on my van.


Could be a vaccum line leaking not changing the vent flap to defrost

Jan 10, 2009 | 2001 Oldsmobile Silhouette

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