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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ArrowheadK5, Nov 22, 2001.

  1. ArrowheadK5

    ArrowheadK5 1/2 ton status

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    Location:
    Northern MN
    Why is the fan on my 87 K5 so much smaller than the one on my 87 K20? Both 350s. Alsoo the K5's fan has fewer blades. I have that in the K20 now, until the wrecking yards open up, seems to run cool enough. But why are they different sizes?

    PS--this morning I was able to slide the fan out w/o removing shroud, just like you all said. I guess I just needed to see it in the daylight.[​IMG] Thaks all!!

    The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
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  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Location:
    Atlanta
    K5 is half ton. K20 is 3/4 ton. 3/4 tons since they are a heavier duty truck are geared more towards handling weight. extra weight means the engine is working harder. Since it's warking harder it's generating more heat. So they put a fan on it that will move more air. Since the K5 is more of luxury type ride they put a fan on with fewer blades because it's quieter.

    Women dig dents and flat paint!
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    Grim-Reaper
     
  3. HarryH3

    HarryH3 1 ton status Author

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    I think that the "standard" GM truck fans are 5 blade designs, while the "heavy duty" fans are 7 blade designs. There are also different size clutch fans. The ones for heavy duty applications are much beefier than the standard ones.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
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