The alt I have does 117 amps. The 97+ XJ's upgraded alts to put out 117. I should be good then shouldnt I?

 

yeah probably.

 

haha!! and my buddy said that doin this mod was a bad idea

 

The stock electric fans are not very powerfull. Stay away from those cheap aftermarket fans with the small blades.
I've got something like this:
Audi A6 twin fans with high flow blades.

 

So will two stock ones handle it then? Or no?


Oh and BTW I couldnt agree more with your saying in your sig.

 

I've had the two stock fans before and on the road they were ok. Off road is a different story.

 

Hmm so should I look for a bigger one to put with the one thats on there already? I actually have one but its an old metal frame one. I done told my bro in law he could have it for his XJ tough truck.

 

Go to the SY and look for a mercedes/bmw/audi fan cuz they have the small motors that fit in the jeep..

 

Not a whole lot of those around here close. I will come up with something. Ima head out to the one just a few miles from the house here. Its where I bought my XJ from. Thats about all he buys at the sales. Hes got a whole field of Jeeps.

 

if you can't fine the eurocar fans, nab one from a mid-90's ford taurus. they cool really well.

 

haha have a look at this..

 

This mod always cracks me up....U won't hear the electric fans because they don't, can't, never have been able to, and never will be able to pull as much air as a locked up mechanical fan.

While I don't know the actual CFM of a Jeep fan I own 2 turbo diesels and have seen guys do it to them as well. A single Dodge turbo diesel mechanical fan pulls over 12,500 CFM and sounds like an airplane landing when it starts to locked up....how many of those black plastic thingys do you need to do that?

The beauty of a dual mechanical/electric system is in the event of a system failure you still have that reliable old mechanical fan to get you home. It only uses any real power when it starts to lock up and that's at temps you want all the fan power you can get.

You don't have to take the word of a guy that lives in the Desert Southwest where we often wheel in 110+ degree weather with the A/C on. Read the many posts here and elsewhere about tempermental or troublesome cooling systems in XJ's and ask urself....."Do ya feel lucky? Well do ya?"

 

That is true like the mechanical fan there is nothing.
Just to be clear the triple fans in the last picture are those to stay away from.
The problem is the drag on the engine that a mechanical fan has.
With the elimination of it you earn those 3/5 hp, that's it.
Another positive point for the electric fans is their efficiency due to a better blade design. This means you can get the same CFM with smaller fans.
The turning speed is also very important, at idle when you need plenty of cooling because the vehicle isn't moving the mechanical fan turns very slow, the electrical fan turns always at the same speed.
Same thing at highway speeds where you basically don't need a fan, the mech fan keeps turning and dragging power, the elec fan is off.
Regarding the electric failures i personally have a redundant electric feed with two relays, cut off switch and toggle, all wired separately on two thermo switches. If one fails the other one takes care, and if you're so lucky that both fail you have always the manual switch.
My fans pull the asphalt and temp sinks from 200 to 170 in less than 30 seconds.

 

Well said. Im about to head to the SL and see what I can find. If it ends up not cooling enough its just four little nuts to put the mech fan back on. No big deal.

 

this idea is interesting to me too, because my jeep has some heat problems when it gets hotter out and i commute alot so the extra mpgs would be nice on the highway.