Details

• Brand:

  

• SKU:

  21200-9HP0A

• Other Names:

  thermostat assembly, coolant thermostat, thermostat housing, engine thermostat, coolant control thermostat, cooling system thermostat

• Description:

  Engine Coolant Thermostat Unit (21200-9HP0A)

  OEM Replacement Part for Nissan

  Experiencing slow engine warm-up, fluctuating temperature readings, weak cabin heat, or overheating? A failing thermostat can disrupt coolant circulation and prevent your engine from maintaining the proper operating temperature. The Genuine Nissan Thermostat Unit (21200-9HP0A) helps restore proper cooling system regulation by controlling coolant flow between the engine and radiator for stable temperature management, improved fuel efficiency, and long-term engine protection.

  The OEM Nissan Thermostat Unit (21200-9HP0A) is engineered to open and close at Nissan’s factory-calibrated temperature specifications to maintain optimal engine performance and reliable cooling system operation.

  Always verify compatibility by VIN before ordering. Enter your VIN above and every order is reviewed by a certified Nissan parts specialist before shipping.

  Specifications

  Part Type: Engine Coolant Thermostat Assembly
  System: Engine Cooling System
  Function: Regulates coolant flow between the engine and radiator to maintain proper operating temperature
  Construction: Precision-calibrated thermostat valve with integrated housing and OEM sealing surfaces
  Material: High-grade stainless-steel valve with heat-resistant seals
  Location: Coolant outlet housing / Engine cooling system
  Includes: One (1) thermostat assembly with integrated housing and seal
  OEM Type: Genuine Nissan OEM Replacement Part
  VIN Required: Yes

  Compatible Nissan Models

  This genuine Nissan thermostat unit fits select Nissan vehicles including:

  2012–2018 Nissan Altima | L33US

  2015–2025 Nissan Maxima | A36US

  2007–2014 Nissan Murano | Z51US

  2014–2024 Nissan Murano | Z52US

  2010–2014 Nissan Murano CrossCabriolet | CZ51US

  2012–2021 Nissan Pathfinder | R52US

  2021–2025 Nissan Pathfinder | R53US

  2010–2017 Nissan Quest | E52US

  Fitment may vary depending on engine configuration, production date, or cooling system setup.

  Check compatibility here by entering your VIN:
  https://parts.chapmannissan.com

  Key Features

  • Factory-Calibrated Temperature Regulation
  Designed to open and close at Nissan-specified operating temperatures.

  • Integrated OEM Housing and Seal
  Provides reliable coolant sealing and factory-correct fitment.

  • Supports Proper Engine Warm-Up
  Helps maintain optimal combustion efficiency and heater performance.

  • Helps Prevent Overheating and Overcooling
  Maintains stable engine operating temperature in varying driving conditions.

  • Durable OEM Cooling System Construction
  Engineered for long-term resistance to heat, pressure, and coolant exposure.

  Failing to Replace a Faulty Thermostat Can Lead To

  Engine Overheating
  A stuck-closed thermostat may restrict coolant flow and cause severe overheating.

  Poor Cabin Heat
  A stuck-open thermostat may prevent the engine from reaching proper operating temperature.

  Reduced Fuel Economy
  An engine running too cool may negatively affect fuel efficiency and emissions performance.

  Coolant Leaks
  Worn seals or housing damage may allow coolant seepage.

  Long-Term Engine Damage
  Repeated overheating can damage cylinder heads, gaskets, and cooling system components.

  Related Components to Inspect or Replace

  Coolant Temperature Sensor
  Monitors engine temperature for ECM operation and cooling system control.

  Radiator Cap
  Maintains cooling system pressure and helps prevent coolant boil-over.

  Water Pump
  Ensures proper coolant circulation throughout the engine.

  Upper and Lower Radiator Hoses
  Inspect for swelling, cracking, or coolant leaks.

  Coolant / Antifreeze
  Replace contaminated or degraded coolant during cooling system service.

  Order with Confidence

  Restore proper cooling system performance and engine temperature regulation with the Genuine Nissan Thermostat Unit (21200-9HP0A) engineered specifically for Nissan cooling systems.

  Always verify compatibility by VIN before ordering. Enter your VIN above and every order is reviewed by a certified Nissan parts specialist before shipping.

  All OEM Nissan parts are shipped directly from Chapman Nissan in Philadelphia, PA, and every order is reviewed by a certified Nissan parts specialist before shipping.

  Most OEM Nissan parts ship within 1–3 business days from certified Nissan warehouses.

  Need assistance confirming compatibility?

  https://parts.chapmannissan.com/contact-us
  Phone: 215-492-1200

  Restore Your Nissan with Genuine Accessories

  Keep your Nissan protected and performing properly with genuine Nissan maintenance parts and accessories including coolant components, splash guards, all-weather floor mats, cargo protection, and OEM service parts engineered specifically for your vehicle.

  Why Buy OEM Nissan Parts from Chapman Nissan?

  Every OEM Nissan cooling system component we sell is engineered to factory specifications for coolant flow, operating temperature accuracy, and long-term durability. Unlike many aftermarket thermostats, genuine Nissan thermostat assemblies are calibrated specifically for proper engine warm-up, cooling efficiency, and emissions performance.

  Fast, secure shipping
  VIN-verified fitment assistance
  Trusted by Nissan owners and professional technicians nationwide

  FAQ

  What are common signs of a failing thermostat?
  Common symptoms include overheating, fluctuating temperature gauge readings, poor cabin heat, or slow engine warm-up.

  Does this thermostat include the housing?
  Yes. This genuine Nissan assembly includes the thermostat pre-installed in the housing.

  Can a faulty thermostat cause overheating?
  Yes. A thermostat stuck closed may prevent coolant circulation and cause overheating.

  Can a thermostat affect fuel economy?
  Yes. A thermostat stuck open may prevent the engine from reaching proper operating temperature, reducing fuel efficiency.

  What coolant should be used after replacement?
  Always use Nissan-approved Long Life Antifreeze/Coolant or the specified coolant type for your vehicle.

• Condition: New
• Notes: Includes Thermostat Housing.
• Applications: 3.5L.
• Replaces:

  21200ja10a

• Warranty:

  This genuine Nissan part is covered by Nissan’s 12-month / 12,000-mile limited parts warranty against defects in materials or workmanship. Labor coverage applies only when installed at an authorized Nissan dealer.

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