On a 1998 B 4000, it is in the housing at the attachment of the upper heater hose.
A diagram of the heater hoses for a 1998 ford ranger can be found in the trucks service manual. Several companies make aftermarket manuals, available through the local auto parts.
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Install block heater in lower rad hose .
Check out the Google Images and search for '93 Ford F150 heater hose'. you should find it there.
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In a repair manual from DISCOUNTAUTOREPAIRMANUALS.COM
Heater core? Inlet or outlet hose fitting at heater core?
For a 1990 Nissan 240SX, the heater hose routing involves two main hoses: the heater inlet and outlet. The heater inlet hose connects from the engine's water outlet (usually near the thermostat) to the heater core, while the outlet hose runs from the heater core back to the engine block or water pump. Ensure the hoses are properly secured and free of kinks for optimal coolant flow. For a detailed diagram, consult the vehicle’s service manual or an online repair guide specific to the 240SX.
You can get a vacuum hose routing diagram for a 1998 Nissan 200SX SE-R from the dealership. You can also order one from the auto parts store.
look below heater hose