Engine Coolant Thermostat

Part Number: 21200-6M43A
Supersession(s): 21200-4Z000; 21200-6M400; 212006M43A

  • Supports your engine's optimum operating temperature
  • Helps regulate the flow of coolant between engine and radiator
  • Replace when malfunctioning

The majority of modern vehicles rely on a fluid called antifreeze or coolant to remain at optimal temperature. Coolant circulates heat away from the engine and out of your vehicle. The Engine Coolant Thermostat regulates coolant flow between the engine, where heat begins, and the radiator, where said heat dispels.

The Engine Coolant Thermostat in your Nissan is a small but mighty device that opens and shuts depending on engine temperature. When you first turn the key in your Nissan's ignition, the Engine Coolant Thermostat remains shut, preventing the flow of coolant until the engine heats up to optimal operating temps. Once your engine is warmed up, the Engine Coolant Thermostat “unlocks,” allowing coolant to circulate, helping curb the risk of your engine overheating.

By supporting your vehicle's optimum operating temperature, your Engine Coolant Thermostat helps reduce engine wear and minimize harmful emissions. In contrast to motor oil and cabin air filters, s typically don't require regular replacements. Rather, these thermostats only need to be changed if they are broken or faulty.

Some signs that your thermostat is malfunctioning include: engine overheating, the engine not coming to temperature, subpar cabin heater performance, or an illuminated dashboard light, in certain vehicles. Additionally, sometimes, a malfunctioning Engine Coolant Thermostat may lead to erratic changes in engine coolant levels or premature antifreeze contamination.

Since the signs of a faulty Engine Coolant Thermostat parallel symptoms of separate issues with the cooling system, we suggest getting an inspection at an authorized service center. But, if you're sure that the Engine Coolant Thermostat is the source of the problem, replacing it with a reliable OEM Engine Coolant Thermostat might help get your engine back to its optimal operating temperature.

Typically, installing a new Engine Coolant Thermostat is a task best left to a certified expert. However, if you're a very proficient at-home mechanic, you may be able to do it yourself. Prior to starting, make sure you have the right components and tools handy: an authentic Nissan Engine Coolant Thermostat replacement, a 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 get repairs from your nearby Nissan experts, double-check the owner's manual when looking to upgrade or repair your car. In addition, ensure proper fit and excellent performance by purchasing a new OEM Engine Coolant Thermostat and other Cooling System components made by Nissan for your Nissan model and year.

This Engine Coolant Thermostat 212006M43A is engineered for Nissan Sentra. Check the What This Fits tab for more details.



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Brandon Nissan

9920 East Adamo Drive, Tampa, FL, 33619

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