Disclaimer: Working with automotive AC systems involves handling refrigerant, which is harmful to the environment and can be dangerous to your health. Improper handling can lead to injury or environmental damage. If you are not comfortable with this procedure, it's best to take your car to a qualified mechanic.
General Steps (Consult your repair manual for precise details and safety precautions):
1. Safety First: Disconnect the negative battery cable to prevent electrical shock. Wear safety glasses and gloves.
2. Refrigerant Recovery: This is CRUCIAL. You MUST recover the refrigerant from the AC system using a proper AC recovery machine. Releasing refrigerant into the atmosphere is illegal and harmful. If you don't have the equipment, take it to a shop.
3. Access the Compressor: This often involves removing various components like the serpentine belt, belt tensioner, and possibly other ancillary components depending on your specific engine. Your repair manual will show you the exact procedure.
4. Disconnect Components: Disconnect the AC compressor clutch wiring harness, the high-pressure and low-pressure AC lines (they'll have Schrader valves similar to tire valves), and any other connected components. Note the location of each connection to ensure proper reassembly. Take pictures!
5. Remove the Compressor Mounting Bolts: Carefully remove the bolts securing the compressor to the engine block or engine mount.
6. Remove the Compressor: Once the bolts are removed, carefully remove the compressor from the engine. It may be helpful to have a helper to support its weight.
7. Install the New Compressor: Install the new compressor in reverse order of removal. Ensure all components are properly seated and secured. Pay special attention to the compressor's orientation and alignment.
8. Reconnect Components: Reconnect the AC lines, electrical connectors, and any other removed components. Again, refer to your repair manual for proper alignment and torque specifications.
9. Evacuate and Recharge the System: After reconnecting everything, use the AC vacuum pump to evacuate any remaining air and moisture from the system. Then, recharge the system with the correct amount and type of refrigerant (again, consult your repair manual). This usually requires specialized tools and knowledge.
10. Reconnect the Battery: Reconnect the negative battery cable.
11. Test the System: Start the engine and turn on the AC. Check for leaks and ensure the system is functioning properly.
Tools You'll Likely Need:
* AC refrigerant recovery machine
* AC vacuum pump
* Manifold gauge set
* Wrench set (metric and possibly SAE)
* Socket set (metric and possibly SAE)
* Torque wrench
* Screwdrivers (various types)
* Pliers
* Safety glasses
* Gloves
* Repair manual specific to your 1998 Chevy Malibu
This is a simplified overview. Refer to your repair manual for detailed instructions and safety precautions. Incorrect installation or handling of the AC system can lead to damage or injury. If you're unsure about any step, consult a qualified professional.
