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Easy fix you will need some vaccine line ..the blend door works off vaccume the vac line runs off the intake and runs into fire wall find the broken line and fix with the vac line ....let there be heat!!
I had the same thing happen with mine. It would really only work on the vent or defrost. It is the motor that changes the doors from defrost,vent and floor the grease dried out. So I cleaned it up and greased it up and now works like a charm ! The heat dries them out. I looked for a new one and couldn't find any, just to let you know
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,
it sounds like the switch lever for the vents, floor and defrost is not switching the vent door that goes to the defroster hose. You need to pull the switch consol out loose from the dash and follow the cable for the defrost that goes to the hose for the defrost. You might also have a broke switch that won't pull the cable enough to open the air for the defrost hose.
There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.
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.
theres a sensor to open the right vent for the ac try flipping
the switch to heat to ac if this doesnt work than you will have to take to a dodge dealership
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.
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