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Blower Motor?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Pugsley, Sep 19, 2001.

  1. Pugsley

    Pugsley 1/2 ton status

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    What is the HD Heater, and how do I know if I've got it? I'm dealing with a complete moron at Napa, and he basically refuses to sell me a new motor until I tell him whether or not I have this option.

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Heavy duty heater looks like this: http://www.dorianyeager.com/TablePics/delcoamfmtapecb.jpg is what your control unit will look like. Both the fan switch and defrost/vent switch have "off" positions, and the fan truly shuts off.

    Consider yourself lucky. Schucks counter person told me that that option was not in the computer, therefore it didn't exist. RPO is something like "C42"

    EXACTLY the same motor as an AC truck (probably all cars too)

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I thought they all looked like that...prolly a default option for Canadian vehicles.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Even with the cooling hose on the motor? The motors wound differently, so the "high" on the HD/AC motor is about twice what "high" is on the non HD heater trucks. (which I assume is why they have a "cooling" hose for the motors)

    Dorian
    My tech/links page: &lt;a target="_blank" href=http://www.dorianyeager.com/index2.html&gt;http://www.dorianyeager.com/index2.html&lt;/a&gt;
    No anti-theft measures on your truck? No pity when its stolen
     
  5. michaelm

    michaelm 1/2 ton status

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    mine didnt have the cooling hose but the replacement motor does. i wondered why they windowed the motor case now i know.
    by the way i just cut the resistor out so that low is now off on mine. cant figure why the fan must always spin ???
     
  6. mike reeh

    mike reeh 1/2 ton status

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    Interesting stuff..

    77chev: excellent idea on just cutting the resistor wire for "Low" to turn the fan off.. I was thinking about the best way to go about that, was thinking of wiring a hidden switch, etc.. sometimes I just think to hard..

    as for it spinning all the time it was some "feature" to keep fresh air in the cab at all times..

    where did you cut the wire?

    mike reeh
    77 K25
     
  7. Hossbaby50

    Hossbaby50 3/4 ton status

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    I pretty sure that I don't have the heavy duty heater on my truck, and I'm glad, the one I got makes the truck feel like I am standing next to a blast furnace. I have been out hunting in the snow, and have had to turn the heater off because it was so darn hot in the cab.
     
  8. michaelm

    michaelm 1/2 ton status

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    if you remove the little cardboard 3 connector item from the plenum in the engine compartment beside the fan motor you will see that chev used little unshielded pigtails of resistant wire. high is the connector that allows the power from the switch to feed the motor without passing through either resistor, medium uses the centre post and heats one resistor before the motor gets the power, low uses the post that will light up both resistor wires before the motor sees any power. i simply cut the pigtail resistor wire from between the low and medium posts. you cant see it unless you pull the part out of the plenum, i like 'invisible' mods.
    hope that made some sense. if you look at the above pics showing the fan motor you can see the connector i am talking about.<a target="_blank" href=http://www.dorianyeager.com/TablePics/heavydutyheater.jpg>http://www.dorianyeager.com/TablePics/heavydutyheater.jpg</a>
     
  9. Pugsley

    Pugsley 1/2 ton status

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    Thanks!! That's what I needed[​IMG] Apparently parts guys are getting even dumber - The Napa computer doesn't even list a HD heater with A/C, only without - and it's the same P/N anyway (BK4551076 for anyone in need of a $ 17.99 replacement)

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  10. dragricinMT

    dragricinMT 1/2 ton status

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    Hey! Let's be nice now. Not all us parts guys are dumb. Espicially us NAPA parts guys.

    78-K5 4"Lift 35"Tires 400SB TH350 NP205
    73 Vega 350SB TH350
     
  11. Pugsley

    Pugsley 1/2 ton status

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    Sorry 'bout that!! Must be a local thing[​IMG]

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  12. dragricinMT

    dragricinMT 1/2 ton status

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    You should try working with them!!!!!!!!!!!!!!!!!!!!!!!!!

    78-K5 4"Lift 35"Tires 400SB TH350 NP205
    73 Vega 350SB TH350
     
  13. fr8train

    fr8train 1/2 ton status

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    So where does that aux. cooling line go to? Can I mount one of those HD fans on a non-HD model? I need some more umpppf in the heater. It does feel like a blast furnace if your up against it but not in the back seat. I am looking for something to broadcast that air back there. I am also considering running some duct work to the rear.

    <a target="_blank" href=http://community.webshots.com/user/thatguydrew23>http://community.webshots.com/user/thatguydrew23</a>
     
  14. Pugsley

    Pugsley 1/2 ton status

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    There's a little nipple on the plenum that it hooks to - I don't see any reason that the HD fan wouldn't work - just make sure to use the HD squirrel cage also.

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

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    You could probably put a filter on the hole for the cooling port. The "squirrel cage" is no different HD or not. I tried using one off of an AC truck, they are way too "long" The AC/HD blower motor simply spins much faster.

    Dorian
    My tech/links page: &lt;a target="_blank" href=http://www.dorianyeager.com/index2.html&gt;http://www.dorianyeager.com/index2.html&lt;/a&gt;
    No anti-theft measures on your truck? No pity when its stolen
     

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