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98 Grand Cherokee heater issues... Help!!

Discussion in 'General Jeep Discussion' started by JKBob 25, Mar 15, 2019.

  1. Mar 15, 2019 at 5:31 PM
    #1
    JKBob 25

    #1
    JKBob 25 [OP] Well-Known Member

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    1998 Jeep Grand Cherokee. 4.0 inline 6. The heater blower motor has been replaced. The heater resistor also. Did a quick swap of the heater switch control panel and nothing still. Heater core seems to be fine. Hot tubes in and out. And it's not auto climate control. It's manual.

    Symptoms started several months ago. Lower fan speeds started to act up, then just failed. Worked only on high speed with good heat. Then recently the high speed stopped working. There is a barely noticeable heat coming from vents. But nothing for the most part. Cant seem to find out if theres any relays im missing. I have goggled and youtubed it several times. And i cant find anything other than blend doors that we havent tried.

    Any help would be greatly appreciated. Thank you :)
     
    JKBob 25, Mar 15, 2019
    #1
  2. Mar 16, 2019 at 8:15 AM
    #2
    Awrench

    #2
    Awrench Well-Known Member

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    I am confused - happens alot.:confused::confused:
    you have NO blower speeds at all ?
    till we get some details -
    check fuse ? IIRC PDC #7 40amp
    was the blower or resistor elec connector damaged?

    ther are 2 controllers 1 manual the other digital AZC - what is your system?
     
    Awrench, Mar 16, 2019
    #2
  3. Mar 16, 2019 at 8:59 AM
    #3
    JKBob 25

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    JKBob 25 [OP] Well-Known Member

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    That's ok. I'm confused too. Lollll

    No....no blower speeds at all. But it went gradually. First slow speeds stopped working. Then high speed went, but it went gradually as well. High speed eventually became slow speed before it finally failed.

    Electrical connections were good. Although resistor was in kinda bad shape as compared to the new one. I don't have access to jeep right now. But I will advise to check fuse.

    It's manual controller. No digital read out or climate control. Thanks @Awrench
     
    JKBob 25, Mar 16, 2019
    #3
  4. Mar 18, 2019 at 5:43 AM
    #4
    JeepMafiaMama

    #4
    JeepMafiaMama Well-Known Member

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    Move the jeep to say Texas or Cali.
    BAM....heat who needs it!!:tumbleweed:.
    ( it's my jeep I think its a good idea):thumbsup:
    I will check fuses as you suggest.
    Oh yeah the resistor was in sad shape.
     
    JeepMafiaMama, Mar 18, 2019
    #4
    Bob, JKBob 25[OP] and aggrex like this.
  5. Mar 18, 2019 at 6:11 AM
    #5
    Prerunner1982

    #5
    Prerunner1982 Well-Known Member

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    Did you check the switch connector for damage? Fairly common in similar year XJs.
    As Awrench mentioned check the fuse in the PDC, also there may/should be a relay mounted to the A/C-Heater box.
     
    Prerunner1982, Mar 18, 2019
    #5
    JKBob 25[OP] likes this.
  6. Mar 18, 2019 at 4:45 PM
    #6
    JKBob 25

    #6
    JKBob 25 [OP] Well-Known Member

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    She replaced the switch. And still nothing.
    I don't have access to Jeep at the moment. So I'm doing some online research. @Prerunner1982 Where exactly might be the relay? There's a PDC in the motor compartment. And several in the passenger side kicker. That one I saw first hand when replacing the blower motor. It I know none was labeled. Thanks for your help guys. Much appreciated.
     
    JKBob 25, Mar 18, 2019
    #6
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