On a 2004 Chevy Impala, the R134a refrigerant charging ports are located
on the compressor, typically near the drier/accumulator. There will be
two ports: a
low-side port (usually blue) and a
high-side port (usually red). You'll connect your refrigerant charging hose to the
low-side (blue) port to add refrigerant.
Never connect to the high-side port unless you're a trained professional using specific equipment.
It's crucial to locate the ports carefully. They're usually capped, and the caps might be color-coded or have labels. However, the color-coding can sometimes be faded or inaccurate, so rely on the low side port being the one for refrigerant addition. If you're unsure, consult a repair manual specific to your 2004 Impala.
