Genuine Nissan Thermostat For HR16 / MR20 Engines 21200-ED00A

Get Genuine Nissan Thermostat For HR16 / MR20 Engines 21200-ED00A in Kenya

The thermostat is a small but essential component of your vehicle’s cooling system. It regulates the engine’s temperature by controlling the flow of coolant between the radiator and the engine block. If the thermostat fails, it can lead to overheating, poor engine performance, or excessive fuel consumption.

For Nissan HR16 and MR20 engines, using a genuine Nissan thermostat ensures optimal performance, longevity, and reliability. In this detailed guide, we’ll cover:
What the thermostat does
How it works
Common signs of failure
How to replace it
Choosing the right thermostat

Understanding the HR16 / MR20 Engine Thermostat 

The HR16 (1.6L) and MR20 (2.0L) engines are widely used in Nissan vehicles, including:

HR16DE Engine: Found in Nissan Note, Tiida, Almera, March, Versa, and Micra.
MR20DE Engine: Used in Nissan X-Trail, Qashqai, Sentra, Serena, and Rogue.

These engines use a mechanical thermostat that controls coolant circulation based on temperature. A genuine Nissan thermostat is precisely engineered to match the cooling requirements of these engines, ensuring:
Correct opening/closing temperature
Efficient coolant flow
Fuel economy and engine longevity

How the Nissan Thermostat Works 

The thermostat functions as a temperature-sensitive valve in the cooling system:

Engine Start (Cold Engine) 

• The thermostat remains closed, preventing coolant from circulating to the radiator.
• This helps the engine warm up faster, improving fuel efficiency.

Engine Reaches Optimal Temperature 

• At around 82-88°C (180-190°F), the thermostat starts to open.
• Coolant flows to the radiator, regulating temperature.

Engine Gets Too Hot 

• The thermostat fully opens to allow maximum coolant circulation.
• This prevents engine overheating and potential damage.

Key Feature: If the thermostat fails in a closed position, the engine overheats. If it fails open, the engine runs too cold, reducing efficiency.

Key Features of a Genuine Nissan Thermostat 

When replacing the thermostat, it’s crucial to use a genuine Nissan part to maintain engine efficiency and prevent cooling system issues.

 OEM-Specified Temperature Rating 

 Nissan thermostats open at the right temperature, preventing overheating.
 Designed for HR16 / MR20 engine cooling requirements.

 High-Quality Materials 

Corrosion-resistant metal housing for durability.
Premium wax-filled thermal element ensures precise operation.

 Proper Fit & Compatibility 

 Exact fit for Nissan HR16 / MR20 engines – no modifications required.
 Works with OEM radiator, water pump, and cooling hoses.

 Reliable Performance 

 Prevents fluctuating engine temperatures.
 Improves fuel efficiency and engine power output.

Avoid cheap aftermarket thermostats that may have incorrect temperature ratings, causing overheating or inefficiency.

Symptoms of a Failing Thermostat 

A faulty thermostat can cause serious engine problems. Look out for these warning signs:

 Engine Overheating 

• Temperature gauge rises quickly into the red zone.
• Coolant may boil over, leading to engine failure.
• Possible radiator hose bursting due to excess pressure.

 Engine Running Too Cold 

• Temperature gauge stays low even after long drives.
• Poor fuel efficiency and sluggish performance.

 Poor Cabin Heating 

• Heater blows cold air instead of warm.
• Indicates the thermostat is stuck open, preventing warm coolant circulation.

 Coolant Leaks 

• A damaged thermostat housing may leak coolant.
• Visible coolant puddles under the car.

Ignoring these symptoms can lead to costly engine repairs!

How to Replace the Nissan Thermostat 

Replacement Interval: Every 60,000 – 100,000 km or when symptoms appear.

Tools & Materials Needed 

 Socket Wrench Set
 Screwdrivers
 Coolant Drain Pan
 New Genuine Nissan Thermostat
 Fresh Nissan Long-Life Coolant
 Gasket Sealant (if required)

Step-by-Step Replacement Guide 

 Drain the Coolant 

• Open the radiator drain plug and drain coolant into a pan.
• Remove the radiator cap for faster drainage.

 Locate the Thermostat Housing 

• On HR16 / MR20 engines, the thermostat is near the water pump.
• Follow the upper radiator hose to find the housing.

 Remove the Old Thermostat 

• Unbolt the thermostat housing cover.
• Take out the old thermostat and gasket.

 Install the New Thermostat 

• Place the new thermostat in the correct orientation (spring facing the engine).
• Install a new gasket to ensure a leak-proof seal.

 Reassemble & Refill Coolant 

• Reinstall the thermostat housing and bolts.
• Tighten bolts to the recommended torque specs.
• Refill the system with Nissan-approved coolant.

 Bleed the Cooling System 

• Start the engine and let it run.
• Open the bleeder valve (if applicable) to remove air pockets.
• Check for leaks and proper temperature regulation.

Your engine cooling system is now restored for optimal performance!

Choosing the Right Thermostat for HR16 / MR20 

When buying a thermostat, ensure:

OEM or Genuine Nissan Part – Avoid unreliable aftermarket brands.
Correct Temperature Rating – Typically 82-88°C.
Includes Gasket – Prevents leaks and ensures proper sealing.

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