AC fan clutch?

Heating, Cooling & AC

  1. Sonny

    Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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    I have a 360 sb in my ‘70 Belvedere that once again has working AC. Was having some minor overheating during Power Tour in the long lines (with AC off). I have a stiff aftermarket fan with non AC style cheap ($35) fan clutch. Is the $230 cost of an “AC” fan clutch (year one) justifiable and will it help or should I just go with a flex fan? I really don’t want to go electric fan.
    Second issue I have is the fan blade is not centered in the shroud (sideways or up and down). Shouldn’t it be? My hunch is the shroud may be from another car. I do have the 26” radiator. Should this car have an 18” or 19” fan? Thanks for any input.
     
  2. 5.7 hemi

    5.7 hemi FBBO Gold Member FBBO Gold Member

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    I’d get the Hayden 2947 fan clutch, 18 inch and run it. The fan will favor the pass side.
     
  3. Rick62

    Rick62 Well-Known Member

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  4. mopar 3 B

    mopar 3 B Well-Known Member

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    Stay away from any type flex fan. And if you will not head the warnning check the blades often.
     
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    • Sonny

      Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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      Even inside the shroud itself?
       
    • 5.7 hemi

      5.7 hemi FBBO Gold Member FBBO Gold Member

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      Yes
       
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      • Sonny

        Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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        After taking some measurements, the proposed 2497 fan clutch will be 1” off the radiator and the fan about 1 1/2” off the radiator. My current set up is 3/4” closer to the radiator than these measurements. The 2497 will put the fan blades half way into the shroud. Does that sound right? Currently when at Operating temp my setup isn’t pulling much air at all thru the condenser.
         
      • 33 IMP

        33 IMP Well-Known Member

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        Most every resource I've seen says half in - half out of shroud is ideal.
         
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        • 5.7 hemi

          5.7 hemi FBBO Gold Member FBBO Gold Member

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          That’ll work.
           
        • Sonny

          Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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          Update. Bought and installed the 2497 fan clutch and WOW! Before it ran 195 at idle. Tonight in Florida it’s still 85. Ran it for 20 min with ac on and never got past 181. Wish I had asked before Power Tour. Ugh. Thanks 5.7 hemi! Would have never thought moving 3/4” away from radiator would improve this much. I’m sure it’s due to moving more air outside the shroud.
           
        • 33 IMP

          33 IMP Well-Known Member

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          Uneducated guess, but fan all the way in the shroud may just be moving air around, half in - half out pulls air out of shroud allowing more flow thru the radiator.
           
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          • 5.7 hemi

            5.7 hemi FBBO Gold Member FBBO Gold Member

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            Glad it worked out and now you can cruise/burn tires!
             
          • RobP

            RobP Well-Known Member

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            That's great!!!!
            Was it the 2497 or 2947? I can't find any info on a 2497....
             
          • Sonny

            Sonny It’s all fun til the rabbit gets the gun. FBBO Gold Member

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            2947. I had it backwards.
             
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