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Quick fan question - 02 or 04 style?

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  #11  
Old 03-14-2021 | 01:00 PM
arains44's Avatar
Rock Crawling
Joined: Dec 2012
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From: Birmingham, AL
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I’d go with @Best4x4 and get one from a parts store. I ordered mine from Rock Auto and they did not come with hardware.

they are threaded so no lock nuts needed. What I found really irritating was that the severe duty and heavy duty clutches had different thread pitch holes and they were a different depth as well... Try to find one with hardware included and save yourself the trouble. Then it’s a super easy project.
 
  #12  
Old 03-14-2021 | 02:16 PM
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Joined: Dec 2009
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From: Charlotte
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FWIW I installed the Hayden 2991 Severe Duty fan clutch about a year and a half ago and just re-used the original bolts.

What's weird is that the cooling results are not as good as they were with the 20-year old fan clutch I replaced only because I was replacing the water pump.

I have the gray 180° thermostat in the truck, so cruising temps are generally 188.6° F, but before replacing the fan clutch the truck rarely got above 194° at stoplights. Now it's common for idle temps to get to ~204°, regardless of ambient temps. Not a problem, I know, but surprising to me. One of these days I may reinstall the original fan clutch and see what happens.
 

Last edited by mln01; 03-14-2021 at 03:11 PM.
  #13  
Old 03-14-2021 | 03:29 PM
Dave03S's Avatar
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From: Seattle, Wa
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I'm sure you already know but that can happen with a tiny bit of air in the system. Have you double checked your bleed through the hole in the T? Again assuming you aren't running the inline mod.
 
  #14  
Old 03-14-2021 | 07:10 PM
mln01's Avatar
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From: Charlotte
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There's no air in the system. It's well-bled, but thanks. Besides, a little air in the system wouldn't produce the results I described.

In fact, maybe I'll introduce a little air into the system to prove the point.
 
  #15  
Old 09-15-2021 | 09:08 AM
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Rock Crawling
Joined: Oct 2020
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From: Nashville, TN
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planning to order the 2781 heavy duty clutch this week. does anyone know what bolts to order? Planning to order from rock auto.
 
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