The power increase with removing the mechanical fan is unbelievable. When I did the mod I thought (Yea, the butt dyno might feel a little bit) but in reality it made a huge difference. I also have a lot of other mods to help support this one. The engine revs MUCH faster than it did with the fan. I'm convinced I will never run a mechanical fan on another automobile in my life. One of my favorite mods.

 

Which fan did you run? Post pics?

 

I'm running the Taurus fan like everyone else. I'm in the middle of rebuilding my engine though.

 

I did two straight blade,early style fans on mine. No aux switch but I did tie the main fan into the A/C fan so it would be triggered if the A/C fan came on. I'm using the Derale controller. I can't tell you how many miles mine has on it because I don't drive it much anymore since I picked up a daily driver but I had no issues with the cooling.

Now, I just added two massive coolers in front of my A/C condenser for power steering and transmission fluid. Massive as in they practically cover everything and are about an inch thick. Both stacked plate designs. Since I've put these on, the temps have risen quite a bit due to the restricted airflow. I haven't wheeled it yet but just driving in traffic with the A/C on, it gets near the red, never into it but close enough that it scares me.

I also keep in mind that I just replaced my thermoswitch for the temp gauge and since I've done that, the gauge has read hotter than it normally did before. So I really have no idea what temp the engine is operating.

 

Red meaning like 240-250*? Your cooking the motor. Wow. Relocate the power steering one or remove it. Save your motor. Or put a YJ/ZJ HD fan clutch on to draw more air.

 

Those sort of temps will put A LOT of wear on your engine. Either switch to a different fan setup or ditch/relocate the PS cooler at a minimum. Your PS pump doesn't need cooling nearly as much as your engine. costs a lot less to replace too.

Your fans are also coming on too late. The a/c fan is set to come on when temps rise above normal operating temps. They are not set to keep the vehicle AT operating temps like you want. By the time those fans are kicking in, they have a much more difficult time cooling things down.

 

No, not that hot. Maybe 225 at most. But again, we're dealing with a complete inaccurate gauge. I'd like to put a real gauge on it just to calibrate the stock one so I know where things are.

The main fan is on all the time but i have it wired so that, just in case, it will always kick on if the A/C is on or the A/C fan is engaged by the thermoswitch.

I'm actually looking at a lower temp thermoswitch for the A/C fan and better fans.

 

Better fans is a must. Those stock electric fans are a joke for cooling, especially the older straight blade style. The straight blade fans are also loud... who wants that?

 

My fans are still working well. While I was stationed in Cali I had NO issues with overheating. Since being in TX I've had a few issues. I fried my aftermarket fan switch/temp sensor when I drove through deep water. I've since just ran it straight to a toggle. The other issue I've had is it tends to run hot while at highway speeds but I really blame the 100+ temps here in TX. The temp runs normal when I'm off road or crawling.

 

I've never found any facts to back that statement up. I've found airflow test on the later model curved blade fans but nobody has ever tested the early model straight blades that I can find. In fact in that test the popular triple fan setup being sold doesn't move as much air as a dual late-model curved blade setup.

It's true they are loud, but that means they're moving air. The curve blade fans actually sacrifice air flow just so they're quiet. I'd rather they be loud and moving air than quiet and not moving air. It's a Jeep, it's not a Lexus.

But I am looking at aftermarket fans, all of them straight blade high-cfm units.

 

you cut off pretty much all air flow get coolers half the size of the smaller one and mount at each side of radiator should cure you temp issues,also grand cherokee fan clutch and newer style xj aux fan..

 

The reason the newer fans push more air and are quieter is that the curved blades push air more effieciently than the straight blade fans.

Want to test this yourself? Grab a sheet of plywood, hold it out in front of you like a wall, and run with it. Now hold the wood like a ramp and run with it.... much easier (more efficient). To move straight blades at the same speed as curved blades takes much more force.

 

I'm not putting a clutch fan back on. I drove it yesterday in 101deg heat and it never got past this point

Straight from the SPAL website.

Q.*** What's the difference between the straight blade fans and the curved blade fans?

A.**** The straight blade fans provide maximum cooling for their size.* The curved blade fans sacrifice a small amount of performance in return for a much quieter fan. If noise is an issue, go with the curved blade fans.* If ultimate performance is the objective, use the straight blade fans.

 

When you put a digital guage in the coolant, what does it show? It looks like 225-235*. Your a/c fan is on I assume. Pretty hot! I wouldn't be happy personally.