My son has a 2000 Ford Taurus, there's not heat in his car?

The car is equipped with a Auto Climate Control Unit. When the heat is turned on the blower motor does turn on as if there's no power to the blower. We have replaced the blower motor and checked all the fuses and relays. Could this be the Climate Control Resistor or the all in one controls on the dashboard? Or did we overlook something else?

You can click on the link below and look through the 3 diagrams then when you're finished, click any other circuit you wanna see a diagram for to the left side of screen. I recommend clicking on power distribution after you read the 1st page. The blower motor does have a blower motor relay which you should test. You can simply borrow another relay from the panel with a matching part # and slide it in place of the suspect blower motor relay to see if the fan will then begin working. If it does, the relay is bad.A low speed and high speed fan relay is also shown in the diagram you're gonna look at when opening the link, but those may be for the cooling fans. If you remove both of them and the cooling fans stop working, they are for the cooling fans and not the blower motor. I would also disconnect the wiring harness from the blower motor, turn the key on, turn the heat and fan on, then test for battery voltage. If voltage isn't present, the wiring harness may have a open or short