I have a 2006 Monaco with a 8.8L 400HP Cummins side radiator . Recently I noticed the engine fan is running full speed all the time . I know the fan is driven hydraulically and I think it thermostatic...
I had the same issue, if you have a sauer danfoss fan drive control, it probably failed. There around $900. I replaced mine four years ago and it failed again, this time I replaced it with THIS. and it works great. Bruce
