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'89 Burb Heater Core

Discussion in 'Chevy Trucks' started by Wally3128, Aug 12, 2004.

  1. Wally3128

    Wally3128 Junior Member
    Messages: 28

    :confused: I need to get some instructions on replacing the heater core on the wife's '89 Suburban!!

    Thank you,

  2. vector6

    vector6 Senior Member
    Messages: 150

    It shouldnt be that bad... the core itself is most likely under the dash, pass side inside the heater box... just a PITA to change.
  3. ratplow408

    ratplow408 Member
    from PA
    Messages: 33

    Get yourself a Chiltons manual and follow instructions. It is a PITA,but can be done in a few hours.I replaced one in my 91 full size blazer it should be the same.There is a stud on the outside firewall down by the inside fender that is hard to get the nut off of(mine was covered w/ undercoating and snapped).And on the ducting on the inside there is a door operated by vacuum switch that has a plastic hinge on end of arm, that also broke. GM part # for hinge is 3018715. Good luck.