However, if you're determined to attempt it yourself, here's a general overview of the process. Remember this is a *general* guide and specifics might vary slightly. Always consult a repair manual specific to your 1997 Chevy Cavalier for precise instructions and torque specifications.
Before You Begin:
* Obtain a Repair Manual: A Haynes or Chilton manual for your specific vehicle is essential. It will provide detailed diagrams and instructions.
* Gather Tools: You'll need a variety of tools including screwdrivers (Phillips and flathead), sockets (various sizes), wrenches, pliers, a coolant recovery system, a drain pan, and possibly special tools for removing specific dashboard components.
* Protective Gear: Wear safety glasses, gloves, and old clothes. Coolant is corrosive.
* New Heater Core: Ensure you have the correct replacement heater core for your vehicle.
* Coolant: Have fresh coolant ready for refilling the system.
General Steps (Simplified):
1. Drain the Coolant: Locate the drain valve on the engine block and the radiator drain cock. Drain the coolant completely into a suitable container.
2. Disconnect the Battery: Disconnect the negative battery terminal to prevent electrical shorts.
3. Dashboard Disassembly: This is the most time-consuming and complex part. You'll need to carefully remove parts of the dashboard, including the glove box, radio, and possibly other trim pieces. Your repair manual will guide you through this step-by-step, often involving removing screws, clips, and possibly disconnecting wiring harnesses. Take photos as you go to aid in reassembly.
4. Access the Heater Core: Once the dashboard is partially disassembled, you'll gain access to the heater core, typically located behind the dashboard.
5. Disconnect Heater Core Hoses: Carefully disconnect the heater core hoses. Have rags ready to absorb any remaining coolant.
6. Remove the Heater Core: This often involves removing mounting screws or clips holding the heater core in place.
7. Install the New Heater Core: Carefully install the new heater core, ensuring it's properly seated and secured.
8. Reconnect Heater Core Hoses: Reconnect the heater core hoses, ensuring they are securely fastened and not leaking.
9. Reassemble the Dashboard: Carefully reassemble the dashboard, referring to your photos and the repair manual. This is a reverse of step 3.
10. Refill Coolant System: Refill the coolant system with the correct mixture of coolant and water. Check for leaks and ensure the system is properly bled to remove any air pockets.
11. Test the Heater: Start the engine and test the heater. Check for leaks and ensure the heater is functioning correctly.
Warnings:
* Airbags: Be extremely careful when working near the airbag system. Accidental deployment could cause serious injury.
* Wiring Harnesses: Be careful when disconnecting and reconnecting wiring harnesses. Incorrect connection could damage your vehicle's electrical system.
* Coolant: Coolant is toxic and corrosive. Avoid skin contact and handle with care.
This is a greatly simplified overview. The actual process is far more involved and requires patience, attention to detail, and mechanical aptitude. Again, strongly consider taking your car to a qualified mechanic to avoid potential damage to your vehicle or injury to yourself. The cost of a professional repair might be significantly less than the cost of fixing mistakes made during a DIY attempt.
