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I'm just pointing it out, because there are several members, who have been around for a long time, that swear they get 10-12MPG. It gets everyone's hopes up, and then we get a bunch of new people in here with unrealistic expectations. The topic comes up periodically. I recently had a guy tell...

My mistake, it is a 26kW (35HP) fan. This military study is where I got the number from. It also talks about the airflow requirements, stating that the "current M1078 cooling fan system required air flow of approximately 8000 to 15000 Cubic Feet per Minute (CFM) (226 to 425 m3/minute)". NOTE...

Yes, absolutely. The difference in military and civilian design is that for the military you must meet their specifications under all (extreme) conditions, and for the civilian market it only needs to be able to do it under ideal laboratory conditions. These trucks all use the same cooling...

I have a few thoughts... You can pick up the military fans, both old and new style, for <$150 surplus. I'm not too concerned about a NOS fan, as it's made out of hard plastic and metal, so age shouldn't really affect it much. The military fan is special because it moves a TON of air...

Thank you for pointing that out to everyone. This is the difference between what you and I are saying, and what I want people who read this thread in the future to get out of it. I'm making it clear my ideas are just speculation, and you're portraying your opinions as facts.

I didn't say I loved it. I'm just saying your theory is shallow. And I don't want newcomers to think there is actually some history or evidence behind it. There are many equally-good reasons they changed the fan. Maybe they needed to change the clutch to a larger one, that no longer fit the...

Many/most of the trucks still have the old fan. I know you're upset yours broke, but if it was actually as bad a design as you suggest, they would have replaced them all long ago, like the driveshafts.

When I got my truck, the coolant switches that activate the fan were incorrect (and judging by the corrosion patina on them, had been that way for a decade). You may need to look through how it's all wired up. The fan should fail to the on position - it's on by default, and the system turns it...

There shouldn't be anything stopping you. Have you had this truck a while?

Where are you broken down at in Colorado? I'm in Colorado. I tried to warn you in the other thread that you couldn't put the new-style fan on the old-style clutch. I have an old-style fan, if you need that.