What kind of refrigerant do you use on a 2000 GMC Sonoma air conditioning?

The 2000 GMC Sonoma most likely used R-134a refrigerant. However, it's crucial to verify this by checking the sticker on your vehicle's AC system. The sticker will be located somewhere under the hood, often near the condenser or on the firewall. It will clearly state the type of refrigerant used. Using the wrong refrigerant can severely damage your AC system.