I have a 2012 Dodge Avenger with the automatic temperature control for the a/c. I am getting a major temperature difference between the dash vents and defroster vent. When its cold out I can get warm air out of the dash but it turns ice cold when turned to defrost mode unless I crank the heat to max. I took it in and was told they could find nothing wrong. This can't be normal is it? When it's cold out I can still get warm air out of the dash vents with the a/c on so I know its not the a/c turning on to cause that.
Check the actuator motors on the heater, they move the arms that move the doors that direct the heat to dash or bottom of car. They are located on the heater at the bottom on the inside of the car.
SOURCE: Heat wont blow through heater or defroster vents
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.
SOURCE: Vent control
You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
SOURCE: heating / air conditioning control stuck to front defrost vents
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.
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