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Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
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Experience:  Have owned a repair shop for 25 yrs.
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1998 s10: replace heater..i can see heater core

Resolved Question:

trying to remove/replace heater core in a 1998 s10 blazer.dash is out of way. i can see heater core.how do i remove this plasticbox??
Submitted: 2 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 2 years ago.

hi

these are aggravating..

this may help you

thanks

Please ACCEPT my answer by clicking the accept button, so I can get credit for my work.i don't receive commission unless you do ..I'm not always going to be giving you good news,so please don't let this stand in the way of you accepting my answer.it does not cost you more money.we will still be able to communicate.please understand,i can not see,hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated!if you are not satisfied with my answer,please do not leave bad feed back,i will gladly opt out and let another expert handle the question.if i have sent any diagrams,please print them.they will only stay on here for an hour or so...sometimes you may need to right click the image,then save picture as]to save it to your computer so you can open it with your picture program...PLEASE ASK IF YOU NEED MORE HELP

 

1998 Chevy Truck S10/T10 Blazer 4WD V6-4.3L VIN W
Heater Core Case Service and Repair, Procedures: Heater Case
REMOVAL PROCEDURE

49_gc02stos_1-097b.png

1. Remove the instrument panel.
2. Drain the engine coolant.
3. On vehicles with automatic climate control only, cut the outer layer of the A/C evaporator and blower module in order to access the service access cover.

50_gc02stos_1-097c.png

4. On vehicles with automatic climate control only, remove the service access cover mounting screws (1).
5. On vehicles with automatic climate control only, remove the service access cover (2).
6. On vehicles without automatic climate control, remove the blower motor resistor.
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.

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

72_gc01stbdy_1-095a.png


8. On vehicles with A/C only, remove the right wheel house panel.

9. On vehicles with A/C only, raise and support vehicle.

10. On vehicles with A/C only, remove the front right tire.
11. On the Utility only, remove the A/C evaporator and blower module heat shield screws.
12. On the Utility only, slide the A/C evaporator and blower module heat shield toward the front of the vehicle.
13. Remove the 2 lower heat/vent module mounting nuts.
14. On the Utility only, remove the A/C evaporator and blower module heat shield bracket.

73_gc01stbdy_1-095b.png



15. 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.

16. 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.
17. On vehicles with A/C only, lower the vehicle.

18. On vehicles with a 2.2L engine only, remove the engine wiring harness bracket located at the rear of the intake manifold.

19. Remove the HVAC module mounting bolt located at the lower left side of the heater core to heater hose connection.
20. 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.

21. On the utility models only, loosen the HVAC module mounting studs until the threads are free from the heat/vent module.
22. Disconnect all of the electrical connectors from the HVAC module.
23. Disconnect all of the vacuum lines from the heater assembly.
24. Disconnect the heater hoses from the heater core.
25. Remove the HVAC module from the vehicle.



INSTALLATION PROCEDURE

53_gc00stbdy_1-098b.png

1. If replacing the HVAC module, transfer the components from the old heat/vent module as necessary.

IMPORTANT: Before installing the HVAC module to the vehicle, ensure that the HVAC module mounting studs are located in the proper positions.

2. Install the HVAC module to the vehicle.
3. Connect the heater hoses to the heater core.
4. Connect all of the vacuum lines to the heater assembly.
5. Connect all of the electrical connectors to the HVAC module.
6. Install the bottom right HVAC module mounting bolt from inside the vehicle approximately halfway into the threads.


7. On the Utility only, install the HVAC module mounting stud located at the lower right side of the heater core to heater hoses connection in the engine compartment.

Tighten the HVAC module mounting stud to 4.5 N.m (40 lb in).

8. On vehicles with A/C only, raise the vehicle. Refer to Vehicle Lifting in Maintenance.
9. On the Utility only, install the bottom right HVAC mounting studs. Ask an assistant to pull the bottom right corner of the HVAC module back from inside the vehicle.

Tighten the heat/vent module mounting studs to 4.5 N.m (40 lb in).

10. On the Utility only, install the A/C evaporator and blower module heat shield bracket.
11. Install the heater/vent module mounting nuts.

Tighten the HVAC module mounting nuts to 4.5 N.m (40 lb in).

12. On the Utility only, slide the A/C evaporator and blower module heat shield into the original position.
13. On the Utility only, install the A/C evaporator and blower module heat shield screws.

Tighten the A/C evaporator and blower module heat shield screws 2.2 N.m (19 lb in).

52_gc00stbdy_1-098a.png


14. On vehicles with A/C only, install the right front tire.

15. On vehicles with A/C only, lower the vehicle.
16. Install the bottom right HVAC module mounting bolt from inside the vehicle.

Tighten the HVAC module mounting bolt to 4.5 N.m (40 lb in).

17. On vehicles with A/C only, install the right wheel house panel. Refer to Wheelhouse Panel Replacement in Body front End.

53_gc00stbdy_1-098b.png

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

Tighten the HVAC module mounting nut to 4.5 N.m (40 lb in).

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

Tighten the HVAC module mounting bolt to 4.5 N.m (40 lb in).

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

IMPORTANT: Use the same mounting bolt marked during removal for the HVAC module during the installation process. Other mounting bolts are longer and will obstruct the operation of the temperature door.

56_gc02stos_1-101a.png


21. Install the HVAC module mounting bolt through the blower motor resistor or service access cover opening.

Tighten the HVAC module mounting bolt to 4.5 N.m (40 lb in).

22. On vehicles without automatic climate control, install the blower motor resistor.

23. On vehicles with automatic climate control only, install the service access cover (2).
24. On vehicles with automatic climate control only, install the service access cover mounting screws (1).

Tighten the screws to 1.9 N.m (17 lb in).

57_gc02stos_1-101b.png


25. On vehicles with automatic climate control only, install the outer layer of the A/C evaporator and blower module.

IMPORTANT: Do not use RTV. Apply the adhesive bead as straight as possible. Allow the adhesive to set for 15 minutes or until the adhesive becomes tacky.

26. Seal the cut line using black weather-strip adhesive.
27. Refill the engine coolant.

28. Install the instrument panel.

 

1998 Chevy Truck S10/T10 Blazer 4WD V6-4.3L VIN W
Heater Core Service and Repair, Procedures: Heater Core Replacement
HEATER CORE REPLACEMENT

REMOVAL PROCEDURE

45_gc02stos_1-096a.png


1. Remove the heater/vent module.

2. Remove the heater core access cover screws.
3. Remove the heater core access cover.

46_gc02stos_1-096b.png

4. Remove the heater core from the heater/vent module.

INSTALLATION PROCEDURE

46_gc02stos_1-096b.png

1.Install the heater core to the heater/vent module.

NOTE: Refer to Fastener Notice in Service Precautions.

45_gc02stos_1-096a.png

2. Install the heater core access cover.

Tighten
^ Tighten the heater core access cover screws to 1.9 Nm (17 lb in).

3. Install the heater/vent module.
Please ACCEPT my answer by clicking the accept button, so I can get credit for my work.i don't receive commission unless you do ..I'm not always going to be giving you good news,so please don't let this stand in the way of you accepting my answer.it does not cost you more money.we will still be able to communicate.please understand,i can not see,hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated!if you are not satisfied with my answer,please do not leave bad feed back,i will gladly opt out and let another expert handle the question.if i have sent any diagrams,please print them.they will only stay on here for an hour or so...sometimes you may need to right click the image,then save picture as]to save it to your computer so you can open it with your picture program...PLEASE ASK IF YOU NEED MORE HELP
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 13068
Experience: Have owned a repair shop for 25 yrs.
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