Not sure what coach and engine you have. In general there is usually a pressure sensor
that triggers power on to the fans at about 230 lbs of pressure. Some systems will power the
Fans on anytime you turn on the air conditioner but that is not likely in your coach. These sensors wil
be on a port on one of the metal tubes. It will be a small cylinder in shape with wires attached usually
maybe an inch in diameter somewhere near the evaporator.
Later Ed
