The heater hoses will be entering the firewall around the middle of the firewall, right above the rack assy. You can follow them to the engine, and find their connections. One or even both might be at the bottom of the intake, and the other will go somewhere near the water pump.
It matters if it has ac or not. If it is a non ac vehicle, the hoses and coolant flow from the fitting close to the thermostat housing to the lower heater core tube, then out the upper heater core tube to the fitting on the water pump. If it has ac, the hose from the upper heater core tube connects to the fitting on the radiator.
Lower radiator hoses in water cooled engines are return lines. The upper radiator hoses are feed lines of hot engine water to the radiator. The reason that lower hoses are cooler is that the radiator has allowed much of the water's heat to dissipate into the air. Thus, a lower radiator hose contains cooler water than other radiator and heater hose lines.
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