Because of the potential for slight variations depending on the specific compressor model used in your Malibu, you'll likely need to:
1. Consult your vehicle's repair manual: This is the most reliable way to find the precise location. A Haynes or Chilton manual for your year and model will have diagrams and descriptions.
2. Look closely at the A/C compressor: With the engine cool and off, carefully inspect the compressor. Look for a small switch with wires connected, often near the electrical connector for the compressor clutch itself.
3. Use online diagrams: Search for "2000 Chevrolet Malibu A/C compressor diagram" online. Several sites offer free diagrams, but be sure the diagram matches your specific model (some have slight differences based on trim levels or options).
Important Safety Note: Always disconnect the negative battery cable before working on any electrical components in your vehicle's electrical system, including the A/C system. Refrigerant under pressure in the A/C system can cause serious injury if it leaks, so be extremely cautious and consider having a qualified mechanic perform the work if you're not comfortable with automotive repair.