first post to mud. Been lurking for a few months but now I’m at a spot where I need some help. Just did a cooling system overhaul. Changed all hoses, changed my heater control valve, drive belts, fan clutch, PHH, full coolant flush including heater coils. Still I do not have hot air coming from the vents. In searching threads I’ve come across that the air mix damper servo may be bad, or possibly the cable to it. Pulled the dash. Cables not seized or broken and in pulling apart the servo I didn’t notice anything that could make me believe it’s bad either. Can I apply 12 v to the motor that’s in the servo to see if it spins? Or will that burn it up? Also any other suggestions on where to look while I have my dash apart?