However, if you're determined to do it yourself, here's a general outline. Remember, this is a general guide, and specifics may vary depending on your Cavalier's trim level and body style. Always consult a repair manual specific to your 1989 Chevrolet Cavalier for detailed instructions and diagrams.
Tools and Materials You'll Need:
* Repair Manual: Absolutely essential for detailed instructions and torque specifications.
* New Heater Core: Make sure you get the correct one for your specific Cavalier model.
* Coolant: The correct type for your vehicle.
* Drain Pan: To catch the coolant.
* Sockets and Wrenches: A wide variety of sizes will be needed.
* Screwdrivers: Phillips and flathead.
* Pliers: Needle-nose and regular.
* Flashlight: For visibility inside the dash.
* Shop Towels or Rags: To clean up spills.
* Possibly a Hose Clamp Pliers: Depending on hose connections.
* Safety Glasses: To protect your eyes.
General Steps (Highly Simplified):
1. Disconnect the Battery: This is crucial for safety.
2. Drain the Cooling System: Locate the drain plug on the radiator and engine block (if applicable) and drain the coolant completely into your drain pan.
3. Prepare for Dashboard Disassembly: This is the most challenging part. You'll likely need to remove parts of the dashboard, steering column components (possibly), and possibly the glove box to access the heater core. Your repair manual will guide you through this. Take pictures as you go to help with reassembly.
4. Access the Heater Core: Once you've removed the necessary dashboard components, you'll finally be able to see the heater core. It's usually located behind the dash, within the HVAC housing.
5. Disconnect the Heater Core Hoses: Carefully disconnect the coolant hoses leading to and from the heater core. Have rags ready to catch any remaining coolant.
6. Remove the Heater Core: This often involves removing screws or clips holding the core in place. The core might be difficult to maneuver out, depending on space constraints.
7. Install the New Heater Core: Carefully install the new heater core in the reverse order of removal, ensuring a proper seal.
8. Reconnect the Heater Core Hoses: Securely reconnect the coolant hoses.
9. Reassemble the Dashboard: This is the reverse of step 3. Again, refer to your repair manual. Take your time and double-check everything.
10. Refill the Cooling System: Carefully refill the cooling system with the correct type of coolant, making sure to bleed air from the system. Consult your repair manual for the proper bleeding procedure.
11. Reconnect the Battery: Once you're sure everything is working correctly, reconnect the battery.
12. Test the Heater: Turn on the heater to ensure proper operation. Watch for any leaks.
Important Considerations:
* Repair Manual: This is paramount. The steps above are highly generalized. A repair manual specific to your vehicle will provide the detailed, step-by-step instructions you need, including torque specifications and diagrams.
* Patience and Organization: This is a time-consuming job. Take your time, be organized, and take lots of pictures as you disassemble the dash.
* Safety: Wear safety glasses and work in a well-ventilated area. Coolant can be toxic.
This process is complex. If you're not comfortable with automotive repair, taking your Cavalier to a professional mechanic is the safest and most efficient way to get the heater core replaced. The cost of a professional repair will likely be less than the cost of replacing damaged parts due to improper installation.
