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93 ZJ Heater

Discussion in 'Cherokee' started by TinyInkognegroT, Nov 8, 2019 at 1:36 AM.

  1. Nov 8, 2019 at 1:36 AM
    #1
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    I know that I have to replace my heater core hoses in order to get hot water moving through the heater core. But does my blower motor have to do with anything related to heat? It's starting to get so cold out here, that the inside of my windshield is starting to freeze over.
     
  2. Nov 8, 2019 at 6:15 AM
    #2
    aggrex

    aggrex Well-Known Member

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    Blower motor will move air through the vents. Big job to get to the heater core which will get you heat at the end. Effective defrosting will need the "other" system.
     
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  3. Nov 8, 2019 at 6:18 AM
    #3
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    So blower motor plays a part in blowing hot air right ? When I turn my heat on, even when I had the heater hoses in the right places, no air was being blown out... Would I need a blower to blow hot air once I get my hoses on?
     
  4. Nov 8, 2019 at 6:59 AM
    #4
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Oh yeah, got to move that hot air.
     
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  5. Nov 8, 2019 at 8:45 AM
    #5
    aggrex

    aggrex Well-Known Member

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    Blower motor is needed to move air through the vents whether hot or cold, fresh or recirculated air. And I'm not just full of hot air .
     
  6. Nov 8, 2019 at 1:30 PM
    #6
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Lol how can I troubleshoot my blower motor that I already have?
     
  7. Nov 8, 2019 at 1:39 PM
    #7
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Disconnect the plug and run wires directly from the battery to the blower. If the fan comes on then I would look at the fuse/relay or switch.
    The switch requires you to remove part of the dash to get to the back of the switch and you would need a multimeter/voltmeter so go through each speed. If you get a low ohm (resistance/continuity) reading they are good.
     
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  8. Nov 10, 2019 at 12:06 PM
    #8
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Notice anything wrong in this picture ? PHOTO_20191110_131929.jpg PHOTO_20191110_131943.jpg
     
  9. Nov 10, 2019 at 12:15 PM
    #9
    aggrex

    aggrex Well-Known Member

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    Disconnected? Missing harness? Blower motor is functional with 12V?
     
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  10. Nov 10, 2019 at 2:46 PM
    #10
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    That Gap where those two connectors are, isn't there supposed to be a heat resistor there? Where would those two connectors connect to?

    Update : Missing blower moter resistor. Without it, the blower motor doesn't work.

    Screenshot_20191110-190745.jpg
     
    Last edited: Nov 10, 2019 at 5:11 PM
    aggrex likes this.
  11. Nov 10, 2019 at 5:12 PM
    #11
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    Hoses reconnected...with a small leak from fire wall

    PHOTO_20191110_175323.jpg
     
  12. Nov 10, 2019 at 6:11 PM
    #12
    TinyInkognegroT

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  13. Nov 10, 2019 at 7:18 PM
    #13
    JKBob 25

    JKBob 25 Well-Known Member

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    That's debatable. :evil:. :rofl:
     
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  14. Nov 10, 2019 at 8:20 PM
    #14
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Heater core is leaking into the box.
    My window would fog up, but I've never seen it rolling like that. Lol
    Passenger floorboard wet?
     
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  15. Nov 10, 2019 at 10:46 PM
    #15
    aggrex

    aggrex Well-Known Member

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    Work on fixing that small leak from the firewall. If the heater core is any good you might have some jeep heat this winter.
     
  16. Nov 11, 2019 at 4:17 AM
    #16
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    I don't know I didn't think the check the passenger floorboard. Does it mean my heater core is bad and needs replaced?
     
  17. Nov 11, 2019 at 4:19 AM
    #17
    JeepMafiaMama

    JeepMafiaMama Well-Known Member

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    Have the same issue with my'98 zj...replaced the blower motor and the resistor. Even went to salvage yard and picked a new control panel thinking that
    Was it. That shit still don't work. It went from one speed (high) to fock you, you get nothing!! I will say alil bit of heat does trickle out the vents but there is no force behind it!! Shitty!!
     
  18. Nov 11, 2019 at 4:42 AM
    #18
    aggrex

    aggrex Well-Known Member

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    If the heater core leaked into the passenger compartment the sweet aroma of coolant would linger or at least the carpet area would be moist.
     
  19. Nov 11, 2019 at 4:46 AM
    #19
    aggrex

    aggrex Well-Known Member

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    Morning JMM, the trickle of heat could be a blend door issue.
     
  20. Nov 11, 2019 at 6:03 AM
    #20
    TinyInkognegroT

    TinyInkognegroT [OP] Well-Known Member

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    I didn't do anything but attached the heater hoses and added coolant. Maybe they're put on backwards ? I'll go and let it do it again and watch the floorboard. I'll also look up a hose diagram for the cooling system to make sure they aren't backwards. could smell a hint of coolant as it was smoking. There was also a weird sound just before and loudens as the smoke comes and increases.

    Never did any of this when the original hoses were attached.
     
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