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heater core and blowermotor upgrades

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by chevyguybc, Jan 4, 2007.

  1. chevyguybc

    chevyguybc 1/2 ton status

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    well living in canada, we do get some harsh winter days.. and lots of rain

    hence why im looking into upgrading to a new heater core and blower motor

    im wondering if there is upgrades sort to speak like a blower motor that pumps out more cfm.. or maybe a bigegr heater core that still fits??:confused:

    anyone tried any of this.. or am i stuck with stock

    if so what year heater cores/motors are inter changable?

    thanks for all your help guys, trying to finish my beast for febuary and i want some KILLER DEFROST HEATER ACTION:o :wink1:
     
  2. imiceman44

    imiceman44 1 ton status

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    I don't know of any bigger core to fit in, but there is a HD blower that blows more CFM
    I think they came on the A/C units but I know you ask for the HD blower at the parts store :D
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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  4. chevyguybc

    chevyguybc 1/2 ton status

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    why didnt that come up when i searched

    cheers man
     
  5. chevyguybc

    chevyguybc 1/2 ton status

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    :D :D picked up a 90 chev blower motor today, definalty bigger motor

    but its got a hole in the case where the motor and stuff actually is.. is this for induction, or do i need to plug this with a sensor or something


    remember im upgrading..

    it bolted into my 77 heater box, and didnt come with the hamster wheel! i put my own on:haha: :haha:

    it was 50 cdn out the door
     
  6. uglytruk

    uglytruk 1/2 ton status

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    The hole is for a bent rubber thingy that draws air from the heater box to cool the larger motor, just wrap electric tape around the whole thing.
    I had a leak in my '86 Sub htr core. Bought a new one from Mexico, and it was half the wieght of the OE Harrison. Only $25, but ya get what ya pay fer...
    So I soldered the little hole in the original, and the heat was GREAT! Better than the "toy" from Big Box, and checked out ALL the retailers, same item, different box.
    AutoZone or Crappy Tire, all the sme sweat shop in Mexico...
    Remove and clean all the connections on the heater box relay and resistor, esp the large red one. common prop area... I'll let someone else tell ya how to remove the wires from the connector... :wink1:
     
  7. chevyguybc

    chevyguybc 1/2 ton status

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    what is the thing called for the 3 prong plug, couple springs attached to the connectors... should i get a new one of those, or is that what your telling me to clean

    if its there to cool the bigger motor, shouldnt I leave it to cool it?
     
  8. uglytruk

    uglytruk 1/2 ton status

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    Cause there's a nipple on the heater box, you ain't got it. Too bad...
    The springy thingy reduces the fan speed when you move the speed switch. Pull the connector off, take a flashlight, look ito the end of the plug for the itty bitty barb that holds the connector onto or into the connector. Poke 'em out and polish up the wire lug, sorry, no pix, almost 3:Am, time for bed...
     
  9. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Are you looking to upgrade for the sake of upgrading or because you have heater issues? :confused:

    FWIW, both my K5 and C10 give off AWESOME heat, at temperatures 25 degrees colder than you ever see out there.
     
  10. chevyguybc

    chevyguybc 1/2 ton status

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    im looking to upgrade the motor because it was on its way out

    and my heater core blew so i needed a new one of those as well

    its all done and on the firewall
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    My dads truck doesn't get driven that much, but he's got the AC blower motor in his truck, with the vent open to atmosphere, no filter, and it still works fine. 5+ years.

    I'd expect more usage and dusty areas would contribute to short fan life with it just open. I personally would leave it open somehow, preferably with a filter of some type. You know GM wouldn't have put it there if the motors that work harder didn't need it.
     
    Last edited: Jan 6, 2007
  12. chevyguybc

    chevyguybc 1/2 ton status

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    i taped it up last night but now you have me thinking.. maybe ill put some sort of filter on it
     
  13. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Cool. Let me know if you notice a big difference. I'd be curious to see some pics of how you made it all work. Were there any issues with the actual fitment of the upgraded parts?
     
  14. uglytruk

    uglytruk 1/2 ton status

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  15. beater_k20

    beater_k20 Banned

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    agreed, the stock heater in my K20 will run you out of the cab with the windows up. i've literally cracked the windows at 20 below because it was just too hot in the cab, and i was only wearing a tshirt and jeans. :eek:
     
  16. uglytruk

    uglytruk 1/2 ton status

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    In the mid 80's and older, GM had a little white woven filter in the air cleaner, that would work well, taped around the "hole" I thunk...
     
  17. dyeager535

    dyeager535 1 ton status Premium Member

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    Ahh, great idea! It's the breather filter, all the carbed '81+ apps should have it. :)

    Might need to trim down the "threads" on it's base so it doesn't hit the fan inner workings, but it might very well be a decent fit!
     
  18. uglytruk

    uglytruk 1/2 ton status

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    or just pull the filter out and tape it to the can. I think the threads are bigger than the hole...
     
  19. K5Greeality

    K5Greeality Registered Member

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    This is great stuff...I had exactly the same question
     

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