ACDelco GM Original Equipment HVAC Control Panels or control heads translate the users commands into mechanical vacuum or electrical signals to operate the blower fan and the blend mode and recirculation doors. Some systems with automatic functions have an integrated or remotely mounted computer module that monitors the control head inputs and the cabin and duct temperatures to adjust the blower speed and door positions to maintain the desired cabin temperature. This original equipment control panel is a GM-recommended replacement for your vehicles original components and has been manufactured to fit your GM vehicle providing the same performance durability and service life you expect from General Motors.