A/C Blowing hot/cold?

My A/C will blow cold in the ranges of low to medium fan speed, with recirculation on and the temperature set to 60. When I press "Max A/C" or set the blower fan to high it begins to blow warm air.

When this happens, I notice that the RPMs fluctuate between 2-300 RPMs. There is a low groaning sound in front of me when I am in the driver's seat but cannot hear it when I open the hood. Additionally, the engine will shudder sometimes during this process. Once I lower the fan speed back to the low to mid-speed setting the air will become cool again.

I have turned the cold/hot dial back and forth several times to ensure it is set to blow cold air. When I turn it to blow hot air, turn the A/C off, and turn the heat temperature up to 84 it works as advertised. I am only having issues with the air at the fan setting of anything higher than medium. The amount of air coming out of the vents does not change when the A/C stops working. It will change as I turn up the speed setting or turn it to "max A/C". I assume this means my blower is

I have not taken it anywhere to be looked at or had my R134a checked. The above conditions happen if recirculating is on or off and in the temperature setting range of 60-75.

In the video I attached, I placed an instant read thermometer in the vent. It is displaying 56 at the beginning and goes up past 80 by the end of the video after I turn the fan speed up. You will also notice the fluctuation in the RPMs. Once the RPMs begin to fluctuate the groaning noise start, then I feel a light "clunk" in the seat and floorboard and the RPMs drop. It will continue this cycle until I lower the fan speed down or turn the car off.