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i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move
I the short answer is yes. The truck has a flow-thru vent feature as does most GM products. When the fan switch is off the outside air would flow into the truck. I thought you could still direct the air by way of the control panel, but by the wiring diagram it looks like everything is disabled when the fan switch is in the off position.
Hello: Remove the panel under the passenger side of the dash, look to front of truck, you will see the blower, follow the wires from the blower motor to the module, remove the connector and see if the terminals are burnt. If so GM has a repair harness to replace the burnt connector, if you need it make sure you have the connector positioned correctly so you get the wires in the proper order. In some cases the module may also be burned and if so it should also be replaced.
the car and turn the air conditioning on. Allow the engine to run a few
minutes so the air can cool. Check to make sure you have the proper
buttons selected. This simple step may uncover the root of the problem.
See if the problem is as simple as a blown fuse. If the
temperature controls on the dashboard seem to work correctly but have no
effect on the air, then this is likely the problem. Find the interior
fuse box in a Kia on the driver's side. It is located near the
floor. Remove the kick board to get to it.
Check the control panel next in your Kia . If the air
conditioning controls are not working at all, then the control panel is
likely to blame. Remove the trim plate surrounding the center instrument
panel. Detach the electrical connectors and remove the control panel.
Listen for the blower motor while the engine is running. The
sound should increase when the air pressure is turned to high. Remove
the blower motor by first unplugging the negative battery connection.
Find the blower motor in your Kia directly in front
of the glove box. You should be able to get to the blower motor without
removing the glove box. Unscrew the four screws holding the motor into
place and pull it downward
The panels (or flaps, if you prefer) that are used to direct the air to the windshield, the panel, or the floor are operated by engine vacuum to be moved one way, and spring tension to move the other. When you step on the gas to climb a hill, or move out from a stop, the vacuum goes away (it is generated by the engine trying to get air, and the closed throttle preventing it from doing so), and the panels are moved into their rest position by the springs. So the air direction can change until the vacuum is reestablished to properly configure the ventilation directing panels.
On my Aries K wagon, the air comes out the defrost when I step on the gas.
Open glove compartment. Press inward at both sides of the glove compartment, then lower the glove compartment.Remove the lower side instrument panel and crash trim pad.
Remove the four glove compartment upper cover retaining screws, then the cover. Remove the two glove compartment retaining bolts, then the glove compartment. Press on the cabin air filter cover tab, then remove the cove Remove the cabin air filter from the blower unit opening. Install a new cabin filter, ensuring the air flow marking is facing in the proper direction. Install the cabin air filter cover, ensuring the cover is properly installed. Position the glove compartment to the instrument panel, then install the two retaining bolts. Install the glove compartment upper cover. Install the lower side instrument panel crash pad. Lift the glove compartment into position. Close the glove compartment.
Air inlet door
Temperature blend door
Auxiliary mode door
The auxiliary A/C and heating system has the following features:
The auxiliary A/C and heating system is functional whenever the instrument panel mounted A/C control is in any position except OFF.
The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
Air is cooled and dehumidified by the auxiliary A/C evaporator core only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor operation.
The temperature blend door and the auxiliary mode door are controlled by electric actuator motors.
Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core.
Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the auxiliary mode door to direct air flow between the panel (headliner) registers and the floor duct.
I would say the auxiliary mode door (#4) electric motor is not wokring.
Auxiliary Blend Door Actuator —Air Distribution
Removal and Installation
Remove the RH quarter trim panel cup holder and access panel.
Remove the screws.
Disconnect the blend door actuator electrical connector.