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jazzmaster
jazzmaster, ASE Certified Tech
Category: GM
Satisfied Customers: 2951
Experience:  ase certified--32 yrs experience
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95 GMC sonoma: HOW TO INSTALL A HEATER CORE

Resolved Question:

HOW TO INSTALL A HEATER CORE ON A 95 GMC SONOMA .CONSOLE HAVE ALREADY BEEN REMOVED.
Submitted: 5 years ago.
Category: GM
Expert:  jazzmaster replied 5 years ago.

hi, here is the procedure to replace the heater core ,the dash has to be removed in order to get the heater casing assembly out to replace the heater core .

INSTRUMENT PANEL REPLACEMENT

Remove Or Disconnect
  1. Negative battery cable.
  2. Disable Supplemental Inflatable Restraint (SIR) system.
  3. Two screws from Instrument Cluster trim plate.
  4. Cluster Trim Plate from Instrument Panel (I/P) .
  5. Electrical connectors as necessary.
    • Tilt steering column down (if equipped).
    • Set parking brake, block wheels, and place automatic transmission in low (if equipp
    • ed
    • graphic
    • Left I/P sound insulator.
    • Diagnostic Link Connector (DLC).
    • Remote Keyless Entry (RKE) /delay module
    • graphic
    • graphic
      1. Center I/P sound insulator.
      2. Knee bolster.
        1. Park brake release cable by squeezing retainers.
        2. Disconnect cable slug from park brake mechanism
          1. Right I/P sound insulator.
          2. Lighter and accessory power outlets (if equipped).
          3. Courtesy lamp.
          4. Knee bolster from the vehicle.
          5. Heating, Ventilation, Air Conditioning (HVAC) control assembly.
          6. Four radio screws.
          7. Radio and storage compartment assembly.
            • Reach behind radio, disconnect antenna and three electrical connectors.
          1. Four steering column screws with 15 mm wrench.
          2. Four lower I/P support screws across bottom of I/P
        3. graphic
        4. Left and right I/P pivot bolts.
        5. graphic
      • I/P lower support to brake pedal bracket
    • graphic
    • I/P lower support bolts.
    • graphic
      1. I/P upper support bolts.
        • Both speaker grills.
        • Windshield defrost grill with flat bladed tool starting at one end and working down the grill.
      1. Electrical connectors, as necessary.
      2. I/P from vehicle.
      3. graphic
      4. HEATER CORE REPLACEMENT

        Remove Or Disconnect
        1. Engine coolant.
        2. Heater hoses.
        1. 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.
Customer: replied 5 years ago.
need more information on how to remove casing it seems to be different from whay you sent me
Expert:  jazzmaster replied 5 years ago.
the casing should have 2-3 bolts and nuts at the firewall and I think 1 inside ,
jazzmaster and 2 other GM Specialists are ready to help you
Customer: replied 5 years ago.

SORRY JAZZ, ITS A 99 GMC SONOMA.WHERE ARE THE SCREWS LOCATED TO REMOVE HEATER CORE 4.3/V6

Expert:  jazzmaster replied 5 years ago.