I was out scraping my windows this morning and noticed that the fan was on. should it be running when the engine is cold?

 

That's normal. The fan never stops spinning unless the engine is shut down. Mine roars until third gear and then releases on cold mornings. As long as it releases and quietens down after you start going up through the gears, it is normal.

 

The only way to stop it is to take the fan off, or get a Horton.

Mike

 

Now I thought the fan would mysteriously come on when needed according to temperature, by use of a clutch. I know when it's hot out and I'm pulling a load the fan will come on with authority, run for a while until the temp decreases, shut off, come back on etc. It will cycle on and off or if it's hot enough it will stay on.

BTW Marine....our trucks could be twins....see sig below.

 

Yours looks alot PRETTIER than mine does!
The fan is on all the time, but the fan clutch determines how fast it will spin according to the temp.

Mike

 

marine whats a horton ? electric?

 

[quote author=jigdog link=board=4;threadid=23746;start=0#msg226542 date=1071874048]
marine whats a horton ? electric?
[/quote]

It's electromagnetic. http://www.hortoninc.com/products/products.asp
It is on my wish list.

Mike

 

mike i think its on my wish list now too ;D

 

[quote author=jigdog link=board=4;threadid=23746;start=0#msg226758 date=1071902861]
mike i think its on my wish list now too ;D
[/quote]

;D

Mike

 

I left my fan off at rebuild been from here to the east coast over the passes several times (I watch it close) been about 4 months now...been towing about 10,000 lbs. So far no fan required.