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HOMESERVICE MANUALSGMC2013RV CUTAWAY 4.8L ENG VIN AREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATING, VENTILATION, AND AIR CONDITIONINGREPAIR INSTRUCTIONSHEATER CORE REPLACEMENTREMOVAL PROCEDURE
2013 GMC RV Cutaway 4.8L Eng VIN A

Removal Procedure

2013 GMC RV Cutaway 4.8L Eng VIN ASECTION Removal Procedure
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac N Fill) , Cooling System Draining and Filling (Static Fill Diesel) .
  2. Remove the A/C accumulator. Refer to Air Conditioning Accumulator Replacement .
  3. Remove the engine cover. Refer to Engine Cover Replacement .
  4. Remove the right knee bolster bracket. Refer to Passenger Knee Bolster Bracket Replacement .
  5. Remove the cowl drain tube bolts.
  6. Remove the cowl drain tube.
  7. Remove the hose clamps using the J 38185  pliers.
  8. Remove the inlet and outlet heater hoses from the heater core.
  9. Remove right hinge pillar trim. Refer to Body Hinge Pillar Trim Panel Replacement .
  10. Remove the ground lead at the right hinge pillar.
  11. Remove the harness connector and bracket in the right hinge pillar.
  12. Disconnect the radio antenna lead-in cable at the right hinge pillar.
  13. Remove the heater outlet duct at the left side of the heater case.
  14. Reposition the wire harness at the hinge pillar and at the heater case.
    15. Fig 1: Heater Assembly
    GM301592Courtesy of GENERAL MOTORS COMPANY
  15. Remove the screws from the heater assembly.
  16. CAREFULLY open the heater core access door in order to cut the heater core access door.
  17. Cut the marked section of the heater core access door and remove the access door.
    18. Fig 2: View Of Heater Core
    GM301590Courtesy of GENERAL MOTORS COMPANY
  18. Remove the retainers from the heater core.
  19. Remove the heater core.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.