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How do I replace the heater core in my 1998 S10 2wheel drive Blazer

Sent to Car Experts February 09 09:33 AM

I have a manual and I have removed the dash out of the vehicle, then I removed the right front tire and all of that stuff, thereis one bolt that I cannot find that is preventing me from being able to get to the dang heater core. What do I do now

Optional Information:
1998 Chevrolet Blazer 2.3

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Answer
February 9 9:43 AM (10 minutes and 5 seconds later)
         
ACCEPTEDCheck Mark

Hello!

Here is the procedure from the service manual for the vehicle. You will note in the last illustration, the dotted lines show the location of the bolts holding the housing to the firewall.

I hope this is helpful; if so, an accept would be most appreciated! thanks!

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

< cellSpacing=2 cellPadding=1> < vAlign=top> <>2. <>Drain the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.

< vAlign=top> <>3. <>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

< cellSpacing=2 cellPadding=1> < vAlign=top> <>Remove the heat/vent module mounting bolt through the blower motor resistor or service access cover opening.

< vAlign=top> <>5. <>Remove the right wheel house panel. Refer to Wheelhouse Panel Replacement in Body Front End.

< vAlign=top> <>6. <>Remove the front right tire. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

< vAlign=top> <>7. <>On the Utility only, remove the A/C evaporator and blower module heat shield screws.

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

< vAlign=top> <>9. <>Remove the 2 lower heat/vent module mounting nuts.

< vAlign=top> <>10. <>On the Utility only, remove the A/C evaporator and blower module heat shield bracket.

< vAlign=top> <>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.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>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.

< vAlign=top> <>13. <>Lower the vehicle.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>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.

< vAlign=top> <>15. <>Remove the HVAC module mounting bolt located at the lower left side of the core to hose connection.

< vAlign=top> <>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.

< cellSpacing=2 cellPadding=1> < vAlign=top> <>17. <>On the Utility only, loosen the HVAC module mounting studs until the threads are free from the heat/vent module.

< vAlign=top> <>18. <>Disconnect all of the electrical connectors from the HVAC module.

< vAlign=top> <>19. <>Disconnect all of the vacuum lines from the heater assembly.

< vAlign=top> <>20. <>Disconnect the hoses from the core.

< vAlign=top> <>21. <>

Remove the HVAC module from the vehicle.

Images available only to Customers.

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Steve7654 -- Auto Service Technician -- 99% Positive Feedback on 1739 Car Accepts
27 yrs ASE L1 Master Technician, Service manager
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