I have a motorhome with the 7400 Vortec 450 hp. engine. I suspect the electric fan is not coming on as needed. I cannot find the sensor for it. As a second question, does the sensor provide for two speeds or is it only a on/off switch. Also does it switch the hot 12v or does it switch the ground side.
The reason I'm concerned is when I stop for a stop light the temp gauge goes to the red. As soon I begin to move the temp remains in the normal I have ruled out a voltage problem and the fan is good. Hills are no problem.
Any help in locating the sensor / switch.
Thanks, Ed