I need some help trying to find what can be wrong with my heat and a/c.
I only get heat, there is no regulating it, it is just high heat. It used to be either on or off, now it's just on. The a/c no longer come on at all. I have no idea if this in the dash electric controls of somewhere else. I would appreciate it if someone could lead me in the right direction.

 

Sounds like the blend actuator is stuck in the hot position. They tend to fail as they are made of plastic with plastic gears. It is located under the dash. Be sure you get the correct one as there are other actuators down there.