The drier is typically a cylindrical component located near the compressor on the front of the engine. Look for a low-pressure port, usually identified by a smaller diameter fitting compared to the high-pressure port. The low-side port is often capped with a blue cap.
To find it, you'll need to:
1. Consult a repair manual specific to your 1999 Chevy Malibu: This is the best way to get the precise location. A Haynes or Chilton manual will be very helpful.
2. Locate the AC compressor: This is a large component near the engine.
3. Follow the AC lines: Look for the lines leading from the compressor. The low-pressure line will be thinner than the high-pressure line.
4. Look near the drier for a service port with a blue cap: This is the most common placement.
Important Note: Working with refrigerant requires specialized knowledge and equipment. Improper handling can be dangerous. If you are not experienced in automotive AC repair, it's best to take your vehicle to a qualified mechanic.