A/C only blows hot

Check the actual air temperature control door for motion as you move the temperature lever. It uses two cables to move the door, if one breaks you can no longer select temperature.
To get to it you need to remove the passenger air bag, then the key-less entry module (if it has it) then you move a heat duct out of the way and you can see the cables and the actuator. Move the temperature lever and see if the cables move and move the door. Turn on the key and the blower, if they seem to be moving the door but the temperature does not get hot/cooler the door itself may be bad.