Which hose do you put the freon in a 93 cadillac deville?

On a 1993 Cadillac DeVille's A/C system, you'll use the low-pressure hose to add refrigerant (Freon). This hose is usually the thinner of the two hoses connected to the AC compressor. It's also often identified with a blue cap or a blue marking on the fitting.

However, a crucial warning: Adding refrigerant without knowing the system's condition is extremely risky and can damage your compressor. Before adding any refrigerant, you should have the system properly diagnosed by a qualified mechanic to identify leaks and check the overall health of the system. Simply adding refrigerant to a leaking system is a waste of money and could lead to further, more expensive repairs.