Pusher fan(s)

Discussion in 'Tech Discussion' started by Charlie, Jun 10, 2018.

  1. Charlie

    Charlie Full Access Member

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    Wondering if anyone has added radiator cooling pusher fan(s) using fan clutch or single electric radiator fan. For instance adding one or 2 smaller fans in front of AC condenser for added cooling.
     
  2. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Pullers are more efficient. As an auxiliary set up a pusher will suffice, but for main means of cooling go with a puller.
     
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  3. yevgenievich

    yevgenievich Full Access Member

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    I have a small accessory pusher on my suburban. Runs with AC
     
  4. Charlie

    Charlie Full Access Member

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    Did not mean main cooling. Just in addition to use with AC and belt driven fan.

    Can you tell if it is an advantage for extra cooling?
     
  5. yevgenievich

    yevgenievich Full Access Member

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    It seem to help a bit for ac at idle on a suburban. On a regular cab did not need one.
     
  6. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    As an aux. set you will be fine.
     
  7. Craig 85

    Craig 85 Supporting Member Supporting Member

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    I know for sure 81-91 Square body trucks and Suburbans with 454's and 4.10 gears came with an auxiliary electric fan mounted on the passenger side IFO the radiator. I've had 3 trucks with this set up. My K30 has 3.73's and did not come with the fan, but I will be installing one. I found that trucks/Suburbans up to 99 had the fan also. Of course the OEM temp sensor has been discontinued, but I found one on e-Bay for a 95 that I'm going to try. The original sensor turned the fan on based on temperature. I don't recall if there was an A/C override, but it would be easy to set up that way. The diagram is for a 92-95. The sensor is AC Delco 15-2624, GM 10096148.

    As a side note, the 2016 Ram 2500 6.4 Hemi I recently sold came from the factory with an electric puller fan ifo the mechanical clutch fan.

    [​IMG]
     
  8. bucket

    bucket Super Moderator Staff Member

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    My '86 Burb had 3.73 gearing and had the fan too. I wonder why your K30 doesn't have one.
     
  9. Craig 85

    Craig 85 Supporting Member Supporting Member

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    I think I figured it out since your's has 3.73's. My K30 doesn't have the Z82 tow package. One of the PO's had an aftermarket receiver hitch on it and it doesn't have the pre-wire for the 7 pin trailer plug. I've had 5 GM trucks between '85 and '95. All had 454's, 4.10 gears and a tow package. I always assumed it was related to the gears and engine.
     
  10. bucket

    bucket Super Moderator Staff Member

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    Yep, it had the towing equipment with the 7-pin wiring.

    I agree it was most definitely a big block thing. My other '86 was a 4x4 with the 350. 4:10 gears and tow equipment too, but no pusher fan. I think if it would have been available on a small block, the original owner would have got it. It even had dual batteries.
     
  11. da_raabi

    da_raabi Trailer Park Supervisor

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    Just a thought. Based on the positioning of the fan, I have to wonder if GM was trying to cool the transmission, more so than the engine? The fan was placed right in front of the internal tranny cooler. Maybe it was for towing etc?
     
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  12. Charlie

    Charlie Full Access Member

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    My only issue is I can only add 1 or 2 9" fans in front of condenser due to the limited space because of the hood latch bracket. Bracket is at an angle inward from top to bottom and this is primarily due to that is where the grill mounts. I measured 10.5" on each side of the bracket and not much room for one behind bracket. I believe a 10" would be too large.

    If I mounted 1- 9" fan to passenger side should it be placed at lower corner of the condenser or centered?
     
  13. Craig 85

    Craig 85 Supporting Member Supporting Member

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    I found a photo of the fan on my truck.

    IMG_1646.JPG
     
  14. Charlie

    Charlie Full Access Member

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    Thank you. It appears to be centered on right side, the best I can tell. This helps.
     
  15. Craig 85

    Craig 85 Supporting Member Supporting Member

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    This is the factory location. There were 4 pre-drilled holes from the factory on the radiator support. The fan is centered on the bottom of that opening. Due to the fact my truck is a big block, the radiator tanks are positioned outside of the openings. If you want a better picture, I can run down to the shop and snap some. I found this on my local CL. This is the same fan as mine.
    https://sacramento.craigslist.org/pts/d/hot-rod-chevy-truck-parts-bbc/6605875533.html

    [​IMG]
     

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