If you have a coach with the Sourer-Danfoss hydraulic fan drive and have experienced failures related to the electronic control unit known as the "FDCA" we have an economical answer to the problem. When these controllers fail, the fan typically will go to full speed and will not modulate; creating several undesired effects.

The pilot valve (wax valve) system in this kit is time tested, extremely reliable, and more efficient than the electronic FCDA.