JeepJeepster
Full Access Member
Thought about replacing the clutch for the mechanical fan? Mine cools wonderfully on my 04 with the electric fan and mechanical fan combo. Fan roars anytime the engine is above 200F.
Radiator fan upgrade
- Thread starter nlocascio
- Start date
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But without the clutch won't it just be on all the time, killing horsepower and fuel economy at anything above idle? I have seen people replace the clutch fan with upgraded one from a Chevy model i can't remember
TwoBobsKJ
Full Access Member
What Jeepster is saying is replace the clutch with a different model.
On mine I went with the Severe Duty Hayden clutch rather than the standard duty. And like Jeepster's, my mechanical fan roars like a Peterbilt truck when the coolant temp gets to 200 degrees. My A/C is slightly warmer at idle or at stop lights but not much and right now it's about 90 degrees and humid enough to cut the air with a knife.
The SD clutch hasn't affected my fuel mileage - I'm on a road trip right now in Western PA and I'm averaging 22mpg's running the A/C, pushing an ARB bumper, full skids on 265/70 Duratracs. Have to get the RPM's up to around 2300 or 2400 and 74mph to get that mileage but makes for a fun drive :gr_grin:
Bob
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uss2defiant
Full Access Member
I changed mine to
https://www.napaonline.com/napa/en/p/TEM271357/TEM271357_0223874290
but dont think this is the severe version.
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renegade 04
Full Access Member
here is the severe duty!
https://www.napaonline.com/napa/en/p/TEM271653/TEM271653_0204601056?interchange=1
It also has a lifetime warranty as well.
https://www.napaonline.com/napa/en/p/TEM271653/TEM271653_0204601056?interchange=1
It also has a lifetime warranty as well.
TwoBobsKJ
Full Access Member
Good find. I bought mine at Summit Racing (their HQ is only 15 minutes away...) but I've also seen the severe duty model at O'Reilly's.
Bob
TwoBobsKJ
Full Access Member
Yep, it'll fit. The shroud and mechanical fan are all the same from '02 through '07 - though not sure how many of the later KJ's actually got the HD cooling. Doesn't seem to be a very popular option in the later years.
Bob
uss2defiant
Full Access Member
does anyone know the pitch of the clutch fan blade?
I just read that heavy and severe duty clutch fan will only be beneficial if the fan pitch is >2.5".
http://www.compressorworks.com/Uplo... 410 FAN CLUTCHES- STANDARD HEAVY, SEVERE.PDF
I just read that heavy and severe duty clutch fan will only be beneficial if the fan pitch is >2.5".
http://www.compressorworks.com/Uplo... 410 FAN CLUTCHES- STANDARD HEAVY, SEVERE.PDF
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TwoBobsKJ
Full Access Member
I just measured the pitch on mine (the nylon fan made for gas/petrol KJ's) and it is 2.5".
For reference, the CRD KJ's came from the factory with a steel fan and the severe duty clutch. Most CRD owners over on LOST upgraded to the nylon fan us gassers got and they've experienced significant cooling improvements - the nylon fan just moves more air.
Like your link indicates, my fan comes on at startup and quits turning after a couple of minutes unless the engine is still hot from a previous drive.
Bob
