I am sure this has been talked to death, but I have been away form Samurais for quite a while. all the threads I found tell me HOW to install an electric fan. I want to know-other than the alledged cool factor-why are you installing an electric cooling fan? Does it really free up that much horsepower? My rig is sort of apart as we put a new clutch in so this would be a good time to do it if necessary. Thanks. PG

If your Samurai has a viscous clutch fan (I believe most US models do), the horsepower/gas mileage gains will be insignificant, so that leaves one reason - you can turn it off before entering water.

In my case the viscous fan was trashed from wading, the power/mpg gains are not noticable.

Thanks folks. I have an 87 sammi, sold here in the US. I assume I have whatever typr of clutch you are talking about and if I don't need to change it out I won't. Don't do much water, either highdesert in New Mexico or Coastal Bend of Texas on the beach.

If it's not a water or space issue, the stock one works great. If it works, don't fix it 

... I assume I have whatever type of clutch you are talking about and if I don't need to change it out I won't.

You can see a fan clutch, often called a clutch fan, for some unfathomable reason, at:
http://www.petroworks.com/Products.php?Action=ViewProduct&ProductID=98 

They all eventually wear out, and almost everyone has had to replace theirs after 15-20 years. I think it's easiest to do with the radiator out.  That way you don't have to remove the water pump, which is another wear-out item. I'd rather not lose what little trail time I get to trail-side repairs, and so I prefer to replace these wear-out parts before they fail. I don't much enjoy lying in the mud/dirt trying to get going again.