What type freon does a 1990 ford econoline use?

1990 Ford Econoline vans likely used R-12 (Freon-12). However, it's crucial to verify this with your vehicle's documentation or a qualified mechanic. R-12 is no longer produced due to its ozone-depleting properties, and any repair would require a legal refrigerant alternative like R-134a (with system modifications) or a suitable R-12 replacement. Don't assume; always check.