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Any car guy would tell you to stick with stock. A jeep guy would tell you to run something that will help a hot running 4.0 stay cooler especially if you wheel a lot at slow speeds thats when temps tend to rise above 220. I never go over 190 when I wheel but I also have the aux fan wired to a switch. As far as gas mileage tanking I wouldn't doubt it. But then again I'm running 33's on 3.55 gears. My jeep is daily capable but it's mostly a trail rig. My mileage is bad already but I'll take cooler temps over a few mpg 's any day. And by no means am I saying stock is inefficient but a zj clutch is an old upgrade with proven results.
My Jeep is just a DD. Those days of thrashing around out there are long over. The only reason I replaced the fan clutch was because of that video somebody posted about what a shot fan clutch and a working fan clutch do when you shut off the engine. Mine spun for awhile. I was not having any cooling problems but figured if the fan clutch was not working like it should it needed to be replaced regardless.
HD fan clutch for the XJ (posts #6, 3). Moves more air than standard but is not jet engine loud like the ZJ fan. Also does not lower fuel economy as much as the ZJ fan.
HD fan clutch for the XJ (posts #6, 3). Moves more air than standard but is not jet engine loud like the ZJ fan. Also does not lower fuel economy as much as the ZJ fan.
Does anyone know what the ZJ clutch part # is?
Originally Posted by 00t444e
After doing some searching I believe the ZJ standard duty fan clutch, and the 2.5 4cly fan clutch are the same part.
The NAPA website shows that #272310 has the following applications:
The NAPA website shows that #272310 has the following applications:
Like I said before most auto parts store (Napa, Advance, Autozone, Orileys) don't list the standard duty fan for the 4.0 ZJ anymore for some reason, buy if you look on Rock auto the standard duty (without Max cooling) ZJ and the 2.5 4cly fan clutch are the same part.
Rock Auto lists these parts for 2.5L XJs. It appears that the Hayden 2737 part that the OP mentioned in his first post is interchangeable with NAPA #272310:
A manually operated switch override would be helpful for only those times you really need it though.
Indeed. I plan on doing it soon but, honestly, I really don't need it. The only cooling issue I experience is heat soak. Even pulling a #2700 trailer in 100 degree heat, a heat-soak restart is the only time my aux fan operates.
04-26-2018, 04:48 AM
