However, I can give you a *general overview* of the steps involved. Keep in mind that specifics will vary slightly depending on the exact trim level and options of your truck:
1. Disconnect the Battery: This is crucial to prevent accidental shorts and electrical damage.
2. Drain the Coolant: Completely drain the engine's cooling system.
3. Prepare for Dashboard Disassembly: This is where the significant work begins. You'll likely need to remove:
* Steering wheel: (May require special tools)
* Steering column shrouds: Provides access to the dash.
* Instrument cluster: Allows access to deeper components.
* Radio and other dash components: These need to be removed to access the heater core.
* Dash panels: Often several panels need to be carefully removed and labelled for reassembly. These are usually held in by clips and screws. Be extremely careful not to break any clips.
4. Locate the Heater Core: Once the dashboard is sufficiently disassembled, you'll find the heater core behind it. It's usually located within the HVAC housing.
5. Disconnect the Heater Core Hoses: Carefully disconnect the coolant hoses connected to the heater core. Have a container ready to catch the remaining coolant.
6. Remove the Heater Core: This step often requires removing the HVAC housing itself. The heater core is usually held in place with clips or screws. Be very careful not to damage the heater core during removal, as it's relatively fragile.
7. Install the New Heater Core: Reverse the removal process to install the new heater core. Make sure all connections are secure and tight.
8. Reassemble the Dashboard: Carefully reassemble the dashboard, ensuring all components are properly secured and connected.
9. Refill the Cooling System: Refill the cooling system with the correct type and amount of coolant.
10. Bleed the Cooling System: This is essential to remove air pockets from the system to prevent overheating.
Important Considerations:
* Climate Control System: Some models have complex climate control systems. Refer to your repair manual for specific instructions on disassembling and reassembling these components.
* Photographs and Diagrams: Take many photographs during disassembly to aid in reassembly. Drawing diagrams may also be helpful.
* Patience: This is a time-consuming process requiring patience and careful attention to detail.
* Professional Help: If you're not comfortable with this level of automotive repair, consider taking it to a qualified mechanic. The cost of professional repair might be less than the cost of parts and labor if you damage something during the process.
Again, this is a general overview. Always consult a repair manual specific to your 1997 Chevy pickup before attempting this repair. The manual will provide crucial details and diagrams that this summary cannot.
