Where is the low pressure valve on a 1993 ford econoline van?

The low pressure valve on a 1993 Ford Econoline van is typically located on the larger diameter refrigerant line, which is the one leading to the evaporator. It is usually near the accumulator or receiver-drier. To identify it, look for a valve with a plastic cap, often colored blue. Always ensure the engine is off and the system is not under pressure before attempting to locate or service the valve.