I am having a problem adjusting the heat on my 2007 tch. When I get in, no matter what it is set at , the temperature is hot. If I turn it down to 65 or Lo, then it cools and I can turn it back up and the heat ill somewhat adjust.

It seems like I have to turn it all the way up or down in order to adjust the temperature. Now when i say "Turn" it, I mean set the temperature, because I have the digital numbers for heat and AC.

Any suggestions? I am wondering if it is the blend door actuator, but I am not sure where it is or how to test it.

Thanks!