Many modern cars, trucks, and SUVs rely on a liquid called antifreeze or coolant to keep the motor running at an optimal temperature. Coolant moves heat away from the motor and pushes it out of the vehicle. The Engine Coolant Thermostat regulates coolant flow between the engine, where heat is produced, and the radiator, where the heat dissipates.

Your Nissan's Engine Coolant Thermostat is a petite but powerful device that opens and closes depending on engine temperature. When you first turn your Nissan on, the Engine Coolant Thermostat remains shut, preventing the flow of coolant until it senses that the engine has reached the ideal operating temperature. Once your engine is warmed up, the Engine Coolant Thermostat opens, allowing antifreeze to circulate, helping curb the risk of your engine overheating.

By supporting your engine's optimal temperature your Engine Coolant Thermostat helps reduce engine wear and cut down on unnecessary emissions. In contrast to engine oil and brake pads, coolant thermostats don't need regular replacements. Rather, these thermostats only need to be changed if they are broken or faulty.

A few telltale signs that your Nissan's Engine Coolant Thermostat is not working the way it should include: engine overheating, engine running cool, lackluster heating and air conditioning performance, or even a check engine light, in certain vehicles. In addition, in certain instances, an Engine Coolant Thermostat that needs replacing may cause drastic changes in coolant levels or faster-than-usual coolant or antifreeze deterioration.

Since the signs of a faulty Engine Coolant Thermostat parallel other signs of cooling system issues, we advise having your Nissan checked out at an authorized service center. However, if you're confident that the Engine Coolant Thermostat is the issue, replacing it with an authentic Nissan Engine Coolant Thermostat may help get your engine back in its comfort zone.

Normally, replacing an Engine Coolant Thermostat is a job best left to a certified expert. However, if you're a very proficient at-home mechanic, you may be able to do it at home. Before you start, ensure you have the necessary components and tools: an authentic Nissan Engine Coolant Thermostat replacement, a new gasket or sealing compound, a socket wrench, protective gloves, a wire brush, and a bucket.

Whether you choose to install your new Engine Coolant Thermostat yourself or visit a local Nissan expert for a professional service, ensure that you always look to the owner's manual as the source of truth for all things related to your vehicle. Additionally, ensure proper fit and outstanding performance by getting an authentic Engine Coolant Thermostat and more components made by Nissan for your Nissan model and year.

This Engine Coolant Thermostat 212001LA1A is engineered for Nissan Armada 2004-2021, Nissan NV2500 2012-2017, Nissan NV3500 2012-2017, Nissan Pathfinder 2008-2012, or Nissan Titan 2004-2015. See the What This Fits tab for fitment info.