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Jerry, Master Mechanic
Category: GM
Satisfied Customers: 17219
Experience:  ASE Master tech, 30 years experience GM certified
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how do i remove the heater core on my 1993 gmc sonoma

Customer Question

how do i remove the heater core on my 1993 gmc sonoma
Submitted: 7 years ago.
Category: GM
Expert:  Jerry replied 7 years ago.

Hello and welcome to Just, Super mechanic here. About your vehicle.



Let me give you the instructions for the heater core. You may already know that the dash has to come out. I have included the steps for it as well.












Remove Or Disconnect

  1. Engine coolant.
  2. Heater hoses.
  1. Instrument panel.
    • Refer to "Dash Board" under Body and Frame / Interior Trim. See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel
  1. Rear case screws. (88)
  2. Rear case. (96)
  3. Screws. (94)
  4. Straps. (93)
  5. Heater core. (92)
  6. Seals. (89 & 90)

Install Or Connect

  1. Seals. (89 & 90)
  2. Heater core. (92)
  3. Straps. (93)
  4. Screws. (94)
  5. Rear case. (96)
  6. Rear case screws. (88)
  7. Instrument panel.
  8. Heater hoses.
  9. Engine coolant.
    • Check the system for leaks.






















  • Disconnect battery ground cable.
  • Remove lamp switch trim plate attaching screws, then pull lamp switch rearward and disconnect wiring harness, Fig. 23.
  • Remove A/C and heater control assembly attaching screws, then pull control assembly rearward and disconnect electrical connector.
  • Remove filler panel attaching screws and filler panel, Fig. 24.
  • Remove instrument cluster housing attaching nuts and cluster housing.
  • Remove instrument cluster attaching nuts, then pull cluster rearward and disconnect electrical connector and speedometer cable.
  • Disconnect transmission control cable from steering column, then remove steering column attaching bolts and lower steering column.
  • Remove ashtray and any wires needed for clearance to remove radio trim plate.
  • Remove radio trim plate, then the nuts from the support clips, Fig. 25.
  • Remove support bracket retaining screws, then pull radio rearward and disconnect electrical connectors, antenna cable and speaker connectors.
  • Remove speaker grille attaching screws, then the speakers, Fig. 26.
  • Remove instrument panel attaching bolts and nuts, then pull panel rearward, disconnect all electrical connectors and remove panel.
  • Reverse procedure to install.

    Jerry and other GM Specialists are ready to help you
    Customer: replied 7 years ago.
    a quick fpllow up, where do the heater core hoses attach to the engine block