Heater core replacement

I attached the procedure for the heater core. Let us know if you need any more info. Thanks

Anytime. Please come back to 2CarPros if you need anything else in the future. Thanks

Heater Core Replacement

Removal Procedure
Remove the heater/vent module. See: Housing Assembly HVAC Service and Repair

Remove the heater core access cover screws.
Remove the heater core access cover.
Remove the heater core from the heater/vent module.
Installation Procedure

Install the heater core to the heater/vent module.

Install the heater core access cover.
NOTE: Refer to Fastener Notice in Service Precautions. See: Service Precautions Vehicle Damage Warnings

Tighten
Tighten the heater core access cover screws to 1.9 N.M (17 lb in).
Install the heater/vent module.

Under the dash on the passenger side. Yes it is hard to get to. Try having it backflushed, the Dexcool the factory uses tends to plug them up causing low/no coolant flow

Yes it is the same thing. With engine hot, check both heater hoses to see I they are hot, if not there is a flow problem with thecore. You can remove the shields under the dash and locate the blend door actuator to see if it is moving when you select different temps

You should be careful how much pressure is applied to the heater core with the hose, they dont like household pressure for very long

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.

Heater core

Part OEM Part Price
Heater Core
Main Heater
Heater Core 52473178 $165.10
Contact dealer for most current part and price information.

Labor Skill
Level Mfg.
Warranty Standard
Heater Core
Replace
Main Heater
Without AC B 3.3 8.3
With AC B 4.1 8.9
NOTE
With Floor Shift, Add B 0.2 0.3

radiator

Part OEM Part Price
Radiator
Radiator
1 - Manual Trans 89040307 $337.83
1 - Auto Trans 89040307 $337.83

Labor Skill
Level Mfg.
Warranty Standard
Radiator
Replace C 0.9 1.4
NOTE
With Auto Trans, Add C 0.1 0.2
With Oil Cooler, Add C 0.1 0.2

head gasket

Labor Skill
Level Mfg.
Warranty Standard
Cylinder Head Assembly
Replace B 5.2 7.5
Includes: R&R Cylinder Head, Grind Or Renew Valves, Transfer All Necessary Components & Make All Adjustments.
NOTE
With AC, Add B 0.2 0.4

gasket, fluids around 125.

Roy

Place the heater setting on defrost does it fog the windshield and if it does then its a good chance that the heater core is leaking
check under hood around the intake manifold and hoses
coolant system pressure test should reveal the leak
check idle air control valve (clean and or replace )

Does it run at operating temp?
Run engine and check heater hoses by the fire wall if both hot and no hot air inside
problem is in the heater box and blend door or blend door actuator