Question about 1999 Dodge Ram

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Ventilation control problem with 1999 Dodge Ram, Cannont redireect air. In all placements of air direction, only go"s though window defrost.

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There is most likely a leaky vacuum line under the hood somewhere that supplies the vacuum needed to move the air mode doors around. Usually I find that the line line is disconnected or broken, often by the passenger side of the intake manifold. Most of the time the line is about 1/8" diameter and made of black plastic. There is more than on line in that area so you may have to carefully inspect all of them to find the problem. Sometimes there is a vacuum diagram under the hood that will show the routing of the lines but often it doesn't include the supply line for the air doors. Hope this helps you find your problem!

Posted on Jul 07, 2010

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Posted on Jan 02, 2017

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Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
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I have a 1999 Dodge Ram 1500 Pick Up, my heater works, but I cannot get the air flow to switch from the floor to vent, or defrost or the blend of defrost and floor. Basically, all I have is floor air. I...


Hi,have you checked your fuses and relays. You can pull glove box out and look and see if the door motors or working ,if they are moving when you turn the mode switch the doors could be broken . You can take the motor off and try to turn by hand and see if they close. Most common problem is were motor connect to door usely break or crack.Thanks if i can help you further just re post.

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There is a blend door problem.

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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

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1 Answer

Ac air comes out on the defrost vents only why?


You have probably lost your vacuum source going to your control, when it has no vacuum it automatically resets itself to defrost as a built in safety feature.

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1 Answer

I would like to understand how the blower switches the air flow from the dashboard to the vents to the floor ie in defrost, AC, or heater modes.


There are several panels, or doors, which are springloade to be one way, and are moved by vacuum diaphragms and rods to the other extreme of their travel.

When you move the controls, you direct vacuum here or there, or remove it from here or there, causing these panels to open or close pathways for the blower air to go through.

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Heater fan only works on "high speed"


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My driver side ac blows cold, passenger side blows warm. whats the problem? 2004 ram 1500 reg cab.


A shutter is out of position, May be able to adjust under passenger dash. Move the controls to spot your target and then sync the contrpol with the shutter position, Good Luc,Ned

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youve got a bad blower motor resister. buy a haynes manual and the resistor and have a windy day again.

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