The 2018 Infiniti QX60's VQ35DD V6 engine maintains proper temperature through a sealed cooling system, but coolant leaks from the water outlet area require attention to prevent overheating. Understanding common leak points helps identify and address the issue efficiently.
Water Outlet Location and Function
The water outlet (also called thermostat housing on some vehicles) connects to the engine block and routes coolant through the system. It typically includes the thermostat and connects to the upper radiator hose. Gaskets and O-rings at this housing deteriorate over time, causing external leaks.
Symptoms of Water Outlet Leak
Coolant dripping from the water outlet area or running down the engine. Low coolant level warnings without visible ground puddles (indicating slow evaporating leak). Sweet coolant smell from the engine bay. Visible coolant residue around the housing or hose connections. Overheating if leak becomes severe.
Diagnostic Process
Pressure test the cooling system at specification to locate the exact leak source. Clean the area and run the engine to observe where fresh coolant appears. Distinguish water outlet leaks from other potential sources including hose connections, intake manifold gaskets, or heater core connections.
Repair Considerations
Water outlet gasket replacement is straightforward but requires cooling system drain and fill. Consider thermostat replacement during service since you're already there—it adds minimal cost and prevents future labor. Use OEM or OEM-equivalent gaskets for reliable sealing. Bleed the system properly after repair to prevent air pockets.