In the 1996 Nissan Pathfinder, the coolant bypass hose is located near the engine's intake manifold, connecting the thermostat housing to the water pump. It allows coolant to circulate when the engine is cold, helping to regulate temperature. To access it, you'll typically need to look at the front of the engine, near the passenger side. Make sure to consult a repair manual for detailed diagrams and instructions if you're planning to inspect or replace it.
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