Engine fan always running

If the fan is running, it's for a reason most likely. I wouldn't want to force it to be off, bad things could happen.

Do you often run A/C or defrost mode? That cycles my fan on and off at low speeds frequently.

 

The old air actuated clutch fans stop working when they don’t have enough air pressure, the newer ones stay on when they do not have enough air pressure. Could be leaky airline, switch, or problem in the clutch drive itself. Im sure there are several other possible sources of problems with all the new technology but if the engine isnt getting hot then air supply and/or temperature sensor is easiest place to start looking.

 

Sounds like its always on, that might be hard on the fuel mileage, but shouldn’t hurt nothing, other than maybe a little more ring wear From what I have seen there aint much wrong with any of the new engines, most of the problems are from the added emissions crap.
When I was a kid you would see old junky trucks broke down all the time, but these days its the new shiny ones sittin along the side of the road.

Sounds like you dont have a manual switch, would be easy to add one, thats all the old trucks ever had, just be darned sure to keep an eye on the temp gauge and never forget to flip that switch when needed! Im not a mechanic, just have done a lot of mechanical work but chose to drive truck for the almighty dollar. Best to yah...

 

It takes a lot of energy to spin that fan. As much as fifty horsepower. That's a while lot of wasted fuel.

 

Remember, there is also a sensor that tells the fan to come on to keep your ac system from imploding. Everyone I know that owns a pro star has had a lot of problems with the ac system. I'm betting your problem starts there.

 

I bet your air to air needs to be taken loose an cleaned. It's almost impossible to clean the radiator out unless you take the air to air loose. I bet if you take it off an clean both real good it will solve your problem.