Where do you put R-134a in a 2003 Chevy Malibu?

You don't put R-134a directly *into* your 2003 Chevy Malibu's AC system. R-134a refrigerant needs to be added through the low-pressure port of the AC system. This is usually a fitting with a larger diameter than the high-pressure port, often colored blue.

However, I strongly advise against attempting this yourself. Adding refrigerant requires specialized equipment and knowledge to ensure proper system pressure and avoid damaging the compressor or other components. Improperly adding refrigerant can be dangerous and expensive to repair.

Instead of doing it yourself, take your 2003 Chevy Malibu to a qualified mechanic or AC specialist. They will have the necessary tools and expertise to diagnose the problem (a leak is the most common reason for low refrigerant), evacuate the existing refrigerant (if needed), repair any leaks, and add the correct amount of R-134a. They can also check the system's oil level, which is crucial for proper compressor function.

Trying to recharge the system without proper equipment and training could lead to serious injury and costly repairs. Professional service is the safest and most reliable way to ensure your AC works correctly.