Where is the blend door actuator located?

Correct me if I am wrong but this has a dial for the heat and cool air, correct? If that is the case then it does not have an actuator, it has a cable and door.

So, if you only have hot air then the likely cause is the Freon or compressor and not the actual blend door.

If this is the case the way to figure out what the issue may be is to start with checking the pressures of the system.

Here is a guide that will help with this:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

We need to know what they are with the A/C on and off so we can determine if it is properly charged and if the compressor is operating.

I attached a chart below that will help with this so let's start with this and go from there. If you don't have a gauge set (most people don't) then you can rent one from a local parts store.