HD Cooling Pkg

sleeve84028 · **Posted:** Mon Oct 22, 2007 3:18 pm

Guys,

I'd like to know if the mechanical fan was ever eliminated from the HD cooling package on the KJ. Any year...

KJ4ME · **Posted:** Mon Oct 22, 2007 3:23 pm

mechanical as in the regular white fan directly in front of the engine? is so then i do believe i have the mechanical fan and i know i have the HD cooling and i have an '07 sport

sleeve84028 · **Posted:** Mon Oct 22, 2007 3:26 pm

Yeah.. the white plastic fan that runs off the waterpump. If you've got an 07 with the HD cooling (that includes that fan) than my question is answered.

KJ4ME · **Posted:** Mon Oct 22, 2007 3:44 pm

yep, i just went outside and verified that i do have it!

sleeve84028 · **Posted:** Mon Oct 22, 2007 3:47 pm

Great thanks a bunch!

Jeepjeepster · **Posted:** Mon Oct 22, 2007 4:16 pm

That fan was included with the towing package.

FastTRX · **Posted:** Mon Oct 22, 2007 4:30 pm

Jeepjeepster wrote:

That fan was included with the towing package.

One of the main reasons I bought my KJ...it had this package...

That extra cooling is important....and helps out alot, especially on summer wheeling trips.

scoobysnax · **Posted:** Mon Oct 22, 2007 6:01 pm

Do you mean that if you don't have the HD cooling pkg you should not have the fan? I'm almost certain I don't have that package and I know I don't have the tow package but I'm pretty sure I have a fan in the same spot. I have to move the car tonight so I'll double check. You're going to make my day if you tell me I have the cooling package! Or now I guess you'll ruin it if you tell me I don't :evil:

myjeepwalks · **Posted:** Mon Oct 22, 2007 6:33 pm

I dont have the tow package so i dont have the fan. Would it be worth adding the fan? Never had any over heating issues. Electric fan seems to work just fine, kicks on and off when needed.

sleeve84028 · **Posted:** Mon Oct 22, 2007 8:35 pm

The extra fan is more insurance than anything. Without it, the electric runs longer when trying to cool a KJ while towing a heavy load. The mechanical fan also comes in handy when you are wheeling and mud gets in the electric motor...

Now I want to know that the mechanical fan is still part of the KK HD cooling package.

Christopher · **Posted:** Mon Oct 22, 2007 8:52 pm

I dont really like the mechanical fans, the clutch can blow on them in deep water crossings, it sucks. The electric ones you can wire a kill switch and change it out with one that pulls more if you really have problems. It also doesnt rob the motor of any power.

Chris

DryBones · **Posted:** Mon Oct 22, 2007 8:56 pm

so a tow package adds a mechanical fan along with a standard electric fan and without the tow package you normally just have an electric fan? I guess if this is true than that mechanical fan can account for more drag and lower MPG's compared to the same vehicle without a tow package.

scoobysnax · **Posted:** Mon Oct 22, 2007 10:22 pm

OK, now I understand. I only have an electric fan, I didn’t realize that there was a possibility to have two fans.

DryBones mentioned lower mpg’s with the tow package and he’s probably correct. A while back when the new (at the time) Dog Ram came out I remember reading about the newly designed fan they put on it. They said they took the idea of the fan blade design from a nuclear submarine and they designed the fan to be light weight (plastic) and bendable so that at low speeds the fan blades were bent more to pull more air and at higher speeds the blades would straighten out a bit to pull less air b/c the it meant that the truck was moving faster and therefore air was getting into the engine anyway. The overall result of that mechanical fan blade was something like 10% less strain on the motor resulting in better fuel economy.

The original fan on that truck was some sort of metal so I’m sure the weight savings alone helped the most. Anyway, I’m sure with the two package the extra force needed to spin the fan uses extra energy from the engine and therefore more gas. I have no idea how much – probably not much at all compared to another KJ without it.

I still wish I had the tow package for the extra transmission and power steering cooling.

HD Cooling Pkg

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