When i accelerate past 50 mph, or register greater than 2750rpm, the climate system automatically goes to windshield defrost, no matter what position the control dial is placed on. When i decelerate under 50mph/2750rpm, i regain vent control. Mods are: 4inch siuspension lift, 33x12.50x15 tires, and 1inch throttle body spacer.
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You have a vacuum leak.Defrost is the default position (no vacuum).
You have a vacuum reservoir that mounts behind the battery. This is for the reserve vacuum to the climate control while you are accelerating,since while accelerating you loose manifold vacuum.
You will see a vacuum line that goes from here to the intake manifold then one that goes from here to the fire wall near the heater coolant hoses and into the car to the controls. Check this carefully and you should find a leak some where in the lines or the reservoir.
Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.
I had a 1994 Dodge Ram. The Red Dodge Ram I had it malfunctioned and my brake became the throttle.
I had to put the truck in reverse then park. to stop, after it was out of control at 80 mph a hill slowed us down. Are you sure
its not electrical and the curse control is not giving you trouble?
Mine had multifunction switch was not working and the headlight switch burned up. I also found out that Audi had problem with the brake becoming the throttle
in the 1980s Daimler Chrysler and Audi were German made. I don't think
there is an easy answer. I hope you stay safe. Another man is having
strange trouble also. I'm sure there are many more people with trouble
with the vehicles. I wish Dodge would step up to the truth. and recall
their nightmares. I saw many of their 1996 Dodge trucks at their
dealers shop with all the electrical pulled out.