Here's what you should NOT do:
* Don't try to recharge it yourself using a home kit designed for R-134a. Your Buick Century uses R-12, and using the wrong refrigerant can damage your system.
* Don't attempt to add refrigerant without knowing the system's pressure. Overcharging is just as bad as undercharging. You need gauges to measure this accurately.
Instead, here's what you SHOULD do:
1. Find a qualified mechanic or AC specialist. This is the safest and most effective option. They possess the proper equipment, including vacuum pumps, gauges, and the ability to handle R-12 safely and responsibly (or convert it to a more modern system if feasible). They'll be able to diagnose the problem (it might not just be a lack of refrigerant) and perform a proper recharge or repair.
2. Consider conversion to R-134a. This is generally more expensive initially but is environmentally friendly and easier to maintain in the long run. A qualified mechanic can assess the feasibility of this conversion for your vehicle's system. This involves replacing several components including seals and possibly the compressor.
3. Understand the potential costs. A simple recharge (if possible with R-12) will be less expensive than a conversion to R-134a or a major system repair. Get quotes from multiple mechanics before proceeding.
In short: While it might seem like a simple fix, attempting to recharge your 1994 Buick Century's AC yourself is strongly discouraged due to the risks involved with R-12. Professional help is your best bet for safety, legality, and a successful repair.
