Forum Discussion
Matt_Colie
Feb 09, 2020Explorer II
Well, You have just discovered something that I knew when I worked at that company. Cooling fans use a lot of horsepower and make a lot of noise. Unfortunately, there is no workable cure.
The fan clutch responds to the temperature of the air coming through the radiator and not the engine temperature as measured by normal equipment. The roar at start up is an artifact of the viscous clutch. They all do that until they die. When it fails to do that, replace it.
Best of luck.
Matt
The fan clutch responds to the temperature of the air coming through the radiator and not the engine temperature as measured by normal equipment. The roar at start up is an artifact of the viscous clutch. They all do that until they die. When it fails to do that, replace it.
Best of luck.
Matt
About Technical Issues
Having RV issues? Connect with others who have been in your shoes.24,284 PostsLatest Activity: Jul 14, 2025