Cold air entering under dash at all times

In a car the heat and filter both go through the same filter. In homes there are normally separate filters for the air and heat.--------------------------------------------------------------------------------------
VAG DASH CAN V5.17

The fuse your looking for is under the hood in front of the driver

If the heat control system is operated by small vacuum hoses, check the hoses under the hood and under the dash at the heater control. The hoses control "doors" or large air-valves which direct heated air. Sometimes the hoses break or become disconnected, and sometimes the doors get stuck.

there is a white box under dash that controls the hot and cold air. it has wires running to it. this has to be replaced.

Hello. The side that is not operating properly has a bad temp door actuator located up under the dash. I am assuming this vehicle has driver/passenger(dual)climate control heat and cold settings. This is a very common problem on these vehicles. Hope you find this information useful!

with a dual climate control system, it is imperative for a proper refrigerant charge to be maintained. the symptom you describe is a possible indicator of low charge on the system. the ac evaporator core is closest to the right side of vehicle thereby making air feel cooler on that side, on the left side of the vehicle the cooled air has farther to travel and warms up from cabin air before it discharged from the vents. this is the most probable issue for your vehicle...however if the charge is accurate, the issue would be more so in the air temperature doors which is located deep inside the dash...i hope this helps...good luck!

The hot and cold air in the front is controlled by an actuator in the dash. The temp controller is working as designed because the back is working fine. You need to take to local shop to have the vent actuator or heater control box inside changed out. Then the tempaturer controller has to be reset. Good luck

the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

I would think the door you hear flapping is the door that controls the airflow across the heater coil - and the fan keeps blowing the door closed, preventing the airflow from going across the heating coil. I don't know whether this vehicle is vacum controlled or cable controlled - so either it's a disconnected cable, or a leaking vacum line.

The lever contols behind the dash have probely dislodged themselvies this can be very hard to fix.