Which hose is the inlet from the engine to the heater core on a 2000 Lincoln navigator?

On a 2000 Lincoln Navigator, the inlet hose from the engine to the heater core is typically the lower hose connected to the heater core. This hose carries hot coolant from the engine to the heater core, allowing the heater to warm the cabin air. It's usually located on the passenger side of the engine compartment. To identify it, look for the hose that connects to the heater core inlet on the firewall.