Air flows from floor vent regardless of position of selector

Hi and thanks for using 2CarPros.

Based on your description, it sounds like the mode door actuator has failed. The mode door is what determines air flow directions. The single mode door actuator is located on the driver side end of the heater-A/C housing unit, close to the top of the distribution housing.

Here are the directions for replacement:

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REMOVAL

Warning: on vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury.

1. Disconnect and isolate the battery negative cable.
2. Remove the instrument panel assembly.
3. Disconnect the electrical connector from the actuator (single or dual zone as required).

Fig. 18 HVAC Housing - Dual Zone Shown (Typical - Dual Zone)

see pic 11

4. Remove the two screws that secure the mode door actuators to the distribution housing. For single zone systems only lower actuator in present. For dual zone systems remove second actuator which is mounted on top of HVAC housing.
5. Remove the mode door actuators from the distribution housing.

INSTALLATION

Warning: on vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury

1. Position the mode door actuators onto the heater/AC housing. If necessary, rotate the actuator slightly to align the splines on the actuator output shaft with those in the mode door linkage.
2. Install and tighten the two screws that secure the mode door actuators to the distribution housing. Tighten the screws to 2 Nm (17 in. Lbs.).
3. Reconnect the HVAC wire harness connector for the mode door actuators to the actuator connector receptacle.
4. Install the instrument panel assembly.
5. Reconnect the battery negative cable.
6. Perform the heater-A/C control calibration procedure.

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Let me know if this helps or if you have other questions.

Take care,
Joe