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What type of refrigerant is used in a 2003 Ford Expedition air conditioning system?

The 2003 Ford Expedition likely used R-134a refrigerant in its air conditioning system. While there were some changes in refrigerant use across automakers and years, R-134a was the standard for most vehicles around that time. However, always confirm by checking your vehicle's owner's manual or a reliable automotive repair source to be absolutely certain.