How can I change the climate control default setting?

possible heater control unit failure as this system has a hot/cold blend door actuator and a separate defrost floor blend door actuator so default setting is defrost for that actuator but not hot setting so controller fault is most likely

Could be the control module or the control on the dash.
The default action is to blow on the windshield to keep it clear.

may be a factory setting do u use all of the controls on the panel for air, etc?

Troubleshoot Automatic Climate Control System

www.aa1car.com/library/automatic_climate_control.ht
Once you set a temperature on your car's automatic climate control system, ... you turn down the blower speed or change the position of the temperature setting. ...codes (which ordinary engine-only scan tools cannot), and a digital voltmeter to ...

sound like maybe the blend door actuator is malfunctioning and needs to be replaced they are all computerized so if the actuator is not working properly it will store a code and not allow to set climat

Could be a vacuum actuator problem. or just a vacuum leak, period. I have a Jeep that when it has a vac leak, the climate system defaults to the defrost, no matter what you set it at.

Sounds like it's the climate control center that is bad. The display shouldn't change by itself.

Climate control need to be reset, turn all functions off and set all switches to CCW position. Disconnect battery for about 10 minutes, reconnect battery and don't touch any controls for several minutes. You may hear the climate control cycling at this time.

There may be a problem in the climate control head. The most common problem with HVAC systems of that error is a broken vacuum line. Usually the feed line to the control panel is broken or disconnected from the engine and it is stuck in defrost mode as it's the default mode. If your stuck in the vent mode there may be a broken line at the climate control panel, a broken line to an actuator or a bad actuator.

Most common cause of this problem is a bad climate control power stage. The power stage control the speed of the blower fan on different settings, if it goes bad it defaults to full blast. There is a small chance the climate contro lunit itself is bad but more than 90% of the time, it is the power stage. It is located near the blower fan under the dash in the passenger footwell area. It makes it much easier to remove the glove box and knee bolster as well as the cover panel. It is rectangular in shape about 1.5" x 3" and black.