Genuine Nissan Engine Oil Cooler

Nissan Pathfinder Engine Oil Cooler Parts Questions & Experts Answers

• Q: How to replace the engine oil cooler on a Nissan Pathfinder with an automatic transmission?

  A: Engines with automatic transmissions have an oil cooler mounted to an adapter at the front of the Oil Pan next to the oil filter. This adapter also houses the oil pressure sending unit and incorporates an oil pressure relief valve. The oil cooler is connected to the engine with two hoses, with one serving as the inlet side and the other as the outlet side. The oil cooler helps lower the oil temperature by using radiator coolant. To replace the oil cooler, drain the engine oil and cooling system, detach the hoses, remove the oil pressure sending unit, and loosen the retaining bolt to remove the oil cooler and O-rings. If necessary, the oil cooler adapter can be removed by separating it from the upper aluminum section of the oil pan. Clean the mating surfaces and install the new gasket before reattaching the adapter. Lubricate the O-rings and install them on the oil cooler, aligning the tabs on the cooler with the casting protrusion on the adapter. Tighten the retaining bolt to the specified torque, install the hoses, and check for leaks after running the engine. Finally, check the oil and coolant levels and add fluids if needed.