2002 GMC Sonoma Heater Core Replacement

Tiny
DISCIPLE726
  • MEMBER
  • 2002 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 82,500 MILES
Im a toyota mechanic and ofcourse my truck has a problem im not familiar with. I have a 2002 gmc sonoma v-6. There is gray coolant smoke blowing out of the vents inside the cab. Ive diagnosed that it is a heater core going bad. I just want to know the procedure and where to start for removal. Whether I can just get a way with pulling the glove box down or if I have to pull the whole dash apart.
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Sunday, January 24th, 2010 AT 12:50 PM

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Tiny
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http://www.2carpros.com/forum/automotive_pictures/147643_heater_core_1.jpg

1. Remove the instrument panel. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.

2. Drain the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.

3. Remove the blower motor resistor. Refer to Blower Motor Resistor Assembly Replacement.

Important :Mark and use the same mounting bolt for the heater/vent module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door.

4. Remove the heat/vent module mounting bolt through the blower motor resistor or service access cover opening.

5. Remove the right wheel house panel. Refer to Wheelhouse Panel Replacement in Body Front End.

6. Remove the front right tire. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

7. On the Utility only, remove the A/C evaporator and blower module heat shield screws.

8. On the Utility only, slide the A/C evaporator and blower module heat shield toward the front of the vehicle.

9. Remove the 2 lower heat/vent module mounting nuts.

10. On the Utility only, remove the A/C evaporator and blower module heat shield bracket.

11. Remove the bottom right heat/vent module mounting bolt from inside the vehicle.

Important :The heat/vent mounting stud has a flange on the inside and cannot be removed from under the hood. Stop turning the stud after the threads are off the heat/vent module.

12. On the Utility only, while an assistant inside the vehicle pulls the bottom right corner of the heat/vent module approximately 2.5 mm (1 in) back, remove the 2 heat/vent module mounting studs.

13. Lower the vehicle.

14. On vehicles with a 2.2 L engine only, remove the engine wiring harness bracket located at the rear of the intake manifold. Refer to Valve Rocker Arm Cover Replacement in Engine Mechanical - 2.2 L.

15. Remove the HVAC module mounting bolt located at the lower left side of the heater core to heater hose connection.

16. Remove the HVAC module mounting nut located at the lower right side of the heater core to heater connection.

Important :The heat/vent mounting stud has a flange on the inside and cannot be removed from under the hood. Stop turning the stud after the threads are off the heat/vent module.

17. On the Utility only, loosen the HVAC module mounting studs until the threads are free from the heat/vent module.

18. Disconnect all of the electrical connectors from the HVAC module.

19. Disconnect all of the vacuum lines from the heater assembly.

20. Disconnect the heater hoses from the heater core.

21. Remove the HVAC module from the vehicle.
have to remove the dash first,not to bad to do.just 6 bolts across the top of the dash and 2 under both speaker covers,3 bulk head connectors under the dash and remove the radio and IPC.outside remove the R/F wheel and fender well,remove the bracket on the firewall and remove the blower resistor,there is a hidden 10mm bolt.not to bad to do,used to do these in about 1 hour,made a living off these at the GM dealer.
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Sunday, January 24th, 2010 AT 5:23 PM

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