Mercury Forum - Mercury Enthusiasts Forums - 2007 Grand Marquis manual climate control issue

I have a 2007 grand marquis with manual climate controls. When I try to change the temperature dial while driving the car, it doesn't change from what it was set at when I started the car. For example, I can put the temperature dial on whatever temperature I want before I start the car and it will come out that temperature. Does anyone have any idea why it would let me change the temperature while the car is off, but not when it is running? The blend door actuator is working because I can go from hot to cold and vice versa when I do the car off and on method, but for some reason it doesn't want to change the temperature while the car is running. I've already tried replacing the manual climate control panel and the petentiometer and that did nothing. Thanks