Parts for your 2013 Nissan Pathfinder-Thermostat

2013 Nissan Pathfinder Thermostat — what it does and when to replace it

Yes, the 2013 Nissan Pathfinder is fitted with an engine thermostat. Nissan’s R52 Factory Service Manual (Cooling System section) and the OEM parts catalogue list a wax‑pellet thermostat (often called a water control valve) for the VQ35DE 3.5‑litre V6 used in this model. The spec calls for a thermostat that begins to open near 82°C and is fully open by roughly 95°C, which matches standard Nissan calibration for this engine family.

The thermostat’s job is to help the Pathfinder warm up quickly and then hold a steady operating temperature under the bonnet. When cold, it stays shut so coolant circulates only through the engine, getting it up to temp faster for better fuel economy, smoother running, and decent cabin heat on a chilly Kiwi or Aussie morning. As temperature rises, the thermostat opens to route coolant through the radiator, keeping overheating at bay even when towing or tackling a long summer climb.

While it’s not a frequent-failure item, age, debris, or using the wrong coolant can make a thermostat stick open (slow warm‑up, weak heater, high fuel use) or stick closed (overheating). As part of servicing a 2013 Pathfinder, it’s smart to check operation any time the cooling system is disturbed.

• Recommended practice: replace the thermostat proactively around 150,000 km or 8–10 years, or whenever the water pump, radiator, or major hoses are replaced.
• Always use an OEM‑spec 82°C thermostat and a new O‑ring/gasket, and refill with the correct Nissan blue long‑life coolant (50/50 mix with demineralised water unless pre‑mixed).

On the VQ35DE, the thermostat housing sits at the front of the engine near the lower radiator hose. A competent DIYer can handle the job with basic tools: drain enough coolant to drop below the housing, remove the housing bolts, swap the thermostat (jiggle pin at the top if equipped), clean mating surfaces, fit the new seal, and torque the housing evenly. Refill slowly, use the bleed screw (where fitted), and run the engine with the heater on to purge air. Keep an eye out for leaks and confirm the temp gauge settles in its usual spot on a road test.

Quick checks that hint it’s time: erratic temp readings, fans running constantly, poor heater output, or any overheating under load. Sort it early and the Pathfinder will keep its cool without dramas.

Popular questions

What are the symptoms of a failing thermostat on a 2013 Pathfinder?
Common signs include slow warm‑up or the temp gauge sitting unusually low (stuck open), weak cabin heat, increased fuel use, or overheating under load (stuck closed). You might also notice coolant being pushed into the overflow bottle after a hot shutdown. If the radiator hoses don’t both get hot after warm‑up, that’s another clue.

How often should the thermostat be replaced?
There’s no strict kilometre‑only interval, but replacing it at around 150,000 km or 8–10 years is good preventative maintenance. Definitely replace it during major cooling system work or if there’s any sign of sticking, fluctuating temperatures, or contamination from old coolant.

Can the thermostat be changed at home?
Yes, for many owners with basic tools it’s a driveway job. Allow time to drain some coolant, remove the housing, swap the thermostat and seal, then refill and bleed the system properly. If bleeding cooling systems isn’t your thing, a workshop can handle it quickly to avoid air pockets and potential overheating.