This sounds a lot like a door actuator it is locate behind the radio part od the dash when you switch the vents like to the floor upper dash do you hear a clicking sound? put your ear to the middle of the dash where the switch to the heat / cool is and listen for the clicking sound when you change the vents direction. If you do it's the vent actuator you will have to remove the face part of the vent and it's in behind that it is usually a white plastic box it may be black but most are white. The cost is about 90 to 120 Canadian dollars.
Hope this helps good luck.
SOURCE: 1997 dodge grand caravan a/c
What are the readings on your A/C service gauges, hi and low sides? If you don't have service gauges, inexpensive ones can be purchased at stores like: Harbor Freight, Walmart, Pep Boys, etc. The gauge readings are the first step to a correct diagnosis.
Your system may be low on refrigerant. If you also have a rear heating unit, the air mixing door or water valve may not be shutting off. Your expansion valve may be bad in the rear unit.
If you can access your rear a/c, check to see if the inlet hose is hot or cold. If it is cold, you are low on refrigerant. If it is hot and the tube coming out of the expansion valve/orifice is cold, this is the way it is supposed to be. If the tube on the outlet of the evaporator is not cold, then you are low on refrigerant or the expansion valve/orifice may be bad.
SOURCE: Heater on driver-side blows barely warm air other vents blow cold
the most probabale cause of this would be a disfunctional hear core if you replace your heater your heater will more than likley work the the way it's supposed to
SOURCE: 2005 dodge grand caravan heat not working. one
There is a recall that has something to do with the air/heat system in 2005 Dodge Grand caravans. Recall F01. Here is a link. I had mine done two weeks ago, cost me nothing. My air conditioner was overheating.
SOURCE: Heat & air in our 06 Dodge Caravan won't blow out at the floor
unfortunatly yes the vent arm must be brokin and probaly is the cable going to it most of them u can access that by taking the cover where vent turn is located and just have a boo and see if its off or not
SOURCE: 2002 dodge caravan front heater blowing cold air
Change your thermostat I was having the same problem and also check that you have enough Preston. Hope this helps.
Kim
NO HEAT ON FLOOR VENTS
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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:----
http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html
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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html
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http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html
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http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
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http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html
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http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html
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http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html
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These
will help.
Thanks.
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