Why you shouldn't do it yourself:
* Refrigerant Handling: R-12 (likely in your 1992 Eldorado) is a CFC refrigerant that is environmentally damaging and requires special recovery and recycling equipment. Improper handling is illegal in most places. Even newer refrigerants require proper handling and safety precautions.
* System Leaks: Simply adding refrigerant without finding and fixing leaks is pointless. The refrigerant will just leak out again, and you'll waste your money and contribute to environmental harm. Finding leaks requires specialized tools and knowledge.
* Vacuuming the System: Before adding new refrigerant, the system needs to be thoroughly evacuated to remove moisture and air. This requires a vacuum pump and the knowledge of how to properly use it.
* Pressure Testing: After repairing any leaks, the system needs to be pressure tested to ensure its integrity before recharging.
What you should do:
1. Take it to a qualified mechanic or AC specialist: This is the safest and most effective approach. They have the proper tools, knowledge, and licenses to handle the refrigerant and repair any leaks. They can also diagnose the problem correctly, which might not just be low refrigerant.
2. Explain the problem clearly: Let the mechanic know the symptoms you're experiencing (e.g., weak cooling, no cooling).
3. Ask about the process: Inquire about the steps they'll take, the type of refrigerant used (R-12 conversion to R-134a is common for older cars, but requires specific procedures), and the cost involved.
In short: While you *could* theoretically find instructions and attempt it yourself, the risks and potential for causing more damage far outweigh the benefits. Professional help is strongly recommended for AC system service on any vehicle, especially older ones like your 1992 Eldorado. The cost of professional service will likely be less than the cost of replacing major components due to improper DIY repair.
