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Has anything been replaced for this already?
Got it! I suspect this could be two things. Either a bad selector switch or a bad blower resistor. If anything, I would suspect a bad switch. However, I would recommend to check the switch first to ensure it is bad before replacing anything. The orange wire coming out of the switch should have battery voltage on it with the switch on the "HIGH" setting. If not, the switch is bad and will need to be replaced. Here is a wiring diagram.
This could be a bad mode door or mode door actuator not fully engaging all of the way.
If you have manual air, they will be vacuum operated. They are called mode valves. Here is a pic.
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