I replaced the heat switch the heater still put out hot air constant on 2007 Ford Ranger

I purchased the vehicle with the heater putting out hot air even when the knob was put on the coldest setting. I replaced the switch but it still continues and turning the knob to hotter makes no difference. I noticed two wiring harnesses in the engine compartment attached to the heater near the bottom of the heater are these sensors which control the vents?

Asked by for the 2007 Ford Ranger