Where do you add refrigerant on a 1998 Chevy Lumina?

The refrigerant charging port on a 1998 Chevy Lumina's A/C system is typically located on the low-pressure side of the system. It's usually a service port with a schrader valve, often capped. It will be near the compressor, condenser, or drier. It might be a low-side fitting colored blue.

However, I strongly advise against attempting to add refrigerant yourself. A/C systems are complex, and adding refrigerant incorrectly can damage the system or even be dangerous. Improperly charging the system can lead to compressor failure, which is an expensive repair.

To properly charge the system, you need:

* An accurate refrigerant gauge set: This allows you to measure the system's pressure and ensure you're adding the correct amount of refrigerant.

* The correct type and amount of refrigerant: For a 1998 Lumina, it's likely R-134a, but check your owner's manual to be sure. The amount needed will vary.

* Leak detection equipment: Before adding refrigerant, you must check for leaks to prevent wasting refrigerant and damaging the system.

Instead of attempting to do it yourself, take your Lumina to a qualified mechanic or A/C specialist. They have the tools and expertise to diagnose the problem properly, locate and fix any leaks, and recharge the system correctly. This will save you time, money, and potential frustration in the long run.