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When thermostat was replaced, the battery was probably disconnected and that caused the HVAC system to lose its calibration. To initiate the calibration properly, first set all HVAC controls to their OFF or CCW positions. Then disconnect the battery for about a 2 - 3 minutes, then reconnect. Do not touch any of the controls for about 2 minutes. If this does not fix the vent problem, you probably have a bad or stuck actuator, or a stuck vent door.
Check the connections at the battery. Loose connections or corroded connections will cause this same symptom.
It is not uncommon for side terminal batteries to also have a problem internally between the mounting button (the place that the cable end bolts to) and the internal connection to the battery.
What sounds like what is happening is the connection is good enough to power up a light load, dash lights, gauges, radio, etc, but when a heavy load is demanded the connection heats up and looses continuity.
I see this issue more on fords but I have seen a fair amount of GM's with this issue.
most ecu controlled vehicles have a 'limp home'mode if 2 or more fault codes are stored,it is designed to get your attention before damage is caused and to get you to the nearest w.shop to fix,i would have codes cleared and retest vehicle,it is the cheapest and 1st option for any shop,some late models even have excessive mileage past service interval in the 'limp' program
Clean your throttle body. Once the battery is disconnected and the computer reset, it no longer increases power to make up for a dirty throttle body. Get a $4 can of carb cleaner. If you go to a mechani9c they will tell you that it is the ac compressor.