No kidding. The grill opening on my BURB compared to my 01 donor truck the DMAX came out of is ridiculously small. I have trouble keeping the DMAX cool in my bURB when towing heavy on a hot day whereas guys in 01+ trucks won't even hear the fan clutch come on.you also have a better body for cooling, the gmt 400 trucks have terrible air flow so they run hot
Your stock 1999 fan flows more air than any electric fan on the market. You wont cool any better by going electric. With the weight you tow I would look into water mist injection. The only advantage electric fans will give you is maybe a little better fuel MPG.We are contemplating doing the switch for more air/engine cooling...anyone done this?
Thanks for your insights.
Mechanical fans will always pull more air than electric fans. You need to get things really hot to verify if your fan clutch is really working or not. My guess is one of three possibilities - 1) that you haven't got it truly hot enough to engage the fan clutch, or 2) the radiator is clogged with debris or 3) you have a bad fan clutch.We are contemplating doing the switch for more air/engine cooling
I picked up 2.2mpg on my belt fan delete.The only advantage electric fans will give you is maybe a little better fuel MPG.
When going from my stock fan "free wheeling" on the high way to not being there at all and gaining 2.2mpg that tells me the free wheeling fan was using about 4 to 5 horsepower.I have heard that a truck sized fan can require in the 5 hp range.
X2disclaimer - I'm not a diesel guy, but I've been around the block trying to cool big blocks doing hard work and found mechanical with a good clutch and proper shroud always wins out over electrics.
On those sorts of grades, with the 12K trailer you WILL overheat with just electric fans. You probably will with the 8K as well. People that have done the electric fan conversions often pull small trailers on flat land and have never experienced a super heavy load on steep grades...they just don't work well on a 6.5.We use the truck to haul our 2 horse trailers....very little commuting, trailers full run 12k and 8k. There are some steep grades that we run...6% for about 6-7 mile stretches.