2021 Ford F-150 Thermostats – OEM & Performance Cooling Solutions

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2021 Ford F-150 Thermostats – Maintain Engine Temperature & Performance

Ensure your 2021 Ford F-150 runs at optimal temperatures with a high-quality thermostat. The thermostat regulates coolant flow, preventing overheating, engine damage, and poor fuel efficiency.

Choose from OEM replacement thermostats for factory performance or low-temperature thermostats for enhanced cooling in towing, off-road, high-performance, or extreme weather conditions.

Thermostat

Part Number: ML3Z-8575-A
Ford Ford
Notes: Included with thermostat housing.
Applications: 3.5L.
Other Names: Thermostat, Thermostat Assembly, rt1250
Description: Expedition, Navigator. F-150. 2021-23. 3.5L.
Fits:
  • Ford:
    • Expedition,
    • F-150
  • Lincoln:
    • Navigator
MSRP $47.09
$30.30

Thermostat Housing

Part Number: JL3Z-8591-A
Ford Ford
Notes: Includes Water Outlet, Thermostat And Gaskets.
Applications: 3.0L Diesel.
Other Names: Water Manifold, Tube Connecting
Description: F150. F-150. 3.0L, main.
Fits:
  • Ford:
    • F-150
MSRP $186.67
$129.92

Thermostat Gasket

Part Number: BR3Z-8255-A
Ford Ford
Notes: Included with water manifold. Included with thermostat housing.
Applications: 3.5L. 5.0L. 2.5L. 3.3L Gas. 2.7L & 3.0L. 3.0L Diesel. 3.3L Hybrid. 2.0L W/HYBRID. 5.2L GT350, GT350R.
Other Names: Thermostat Gasket, Gasket, Engine Coolant Thermostat Housing Seal, Thermostat Seal, Thermostat Housing Gasket, Thermostat Cover...
Fits:
  • Ford:
    • Bronco,
    • C-Max,
    • Edge,
    • Escape,
    • Expedition,
    • Explorer,
    • F-150,
    • Fusion,
    • Maverick,
    • Mustang,
    • Police Interceptor Utility,
    • Police Responder Hybrid,
    • Ranger,
    • SSV Plug-In Hybrid,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Aviator,
    • Continental,
    • Corsair,
    • MKX,
    • MKZ,
    • Nautilus,
    • Navigator
MSRP $3.53
$2.27

Thermostat Housing

Part Number: BL3Z-8A586-G
Ford Ford
Notes: Includes Water Outlet, Thermostat, And Gaskets. Includes Housing Gasket (Lower), Thermostat, Thermostat Gasket And Water Outlet.
Applications: 3.5L. 3.7L. 3.3L Gas. 3.3L Hybrid.
Other Names: Engine Coolant Thermostat Kit, Thermostat Unit, Connection Water Outlet, rh309
Replaces: BL3Z-8592-C, BL3Z-8A586-B, BR3Z-8592-B, RH-244
Fits:
  • Ford:
    • Expedition,
    • Explorer,
    • F-150,
    • Mustang,
    • Police Interceptor Utility,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Navigator
MSRP $205.00
$142.68

Thermostat Housing

Part Number: ML3Z-8A586-C
Ford Ford
Notes: Includes Thermostat, Gasket, And Housing. Includes Water Outlet, Thermostat And Gaskets.
Applications: 3.5L.
Other Names: Engine Coolant Thermostat Kit, Connection Water Outlet, rh308
Replaces: ML3Z-8A586-A, RH-303
Description: F-150. Expedition, Navigator. 2021-23. 3.5L.
Fits:
  • Ford:
    • Expedition,
    • F-150
  • Lincoln:
    • Navigator
MSRP $330.00
$229.68

Thermostat Housing

Part Number: BL3Z-8A586-F
Ford Ford
Notes: Includes Water Outlet, Thermostat And Gaskets.
Applications: 5.0L.
Other Names: Connection Water Outlet
Replaces: BL3Z-8A586-A, BL3Z-8A586-C, BL3Z-8A586-D, BL3Z-8A586-E, BL3Z-8A586-FA
Description: F150. 5.0L, main, single alternator. F-150. Without power converter.
Fits:
  • Ford:
    • F-150
MSRP $197.18
$137.24

Thermostat Outlet

Part Number: BR3Z-18599-A
Ford Ford
Notes: Included with thermostat housing.
Applications: 5.0L. 5.2L GT350, GT350R.
Other Names: Water Inlet, Water Outlet, Inlet Connector, Thermostat Cover, Connection Water Inlet
Description: F150. 5.0L, main, single alternator. Mustang. Without supercharger. Manual transmission. With high output.
Fits:
  • Ford:
    • F-150,
    • Mustang
MSRP $60.00
$34.80

Thermostat Housing

Part Number: ML3Z-8A586-B
Ford Ford
Notes: Includes Water Outlet, Thermostat And Gaskets.
Applications: 5.0L.
Other Names: Connection Water Outlet, rh306
Description: 5.0L, main, dual alternator. F-150. With power converter. Power inverter #2.
Fits:
  • Ford:
    • F-150
MSRP $1,837.70
$1,234.93

Thermostat Gasket

Part Number: HL3Z-8255-A
Ford Ford
Notes: Included with thermostat housing.
Applications: 3.5L. 2.3L. 2.0L.
Other Names: Gasket, Engine Coolant Thermostat Gasket, Thermostat O-Ring, Seal Thermostat, rg640
Fits:
  • Ford:
    • Bronco,
    • Bronco Sport,
    • Edge,
    • Escape,
    • Expedition,
    • Explorer,
    • F-150,
    • Maverick,
    • Ranger
  • Lincoln:
    • Corsair,
    • Nautilus,
    • Navigator
MSRP $10.45
$6.73

Thermostat Outlet

Part Number: BR3Z-8592-Q
Ford Ford
Notes: Included with thermostat housing.
Applications: 3.5L. 3.7L. 3.3L Gas. 3.3L Hybrid.
Other Names: Water Outlet, Engine Coolant Thermostat Housing, Outlet Tube, Connection Water Outlet, rh226
Fits:
  • Ford:
    • Expedition,
    • Explorer,
    • F-150,
    • Mustang,
    • Police Interceptor Utility,
    • Transit-150,
    • Transit-250,
    • Transit-350,
    • Transit-350 HD
  • Lincoln:
    • Navigator
MSRP $256.67
$178.64

Thermostat Outlet

Part Number: ML3Z-8592-A
Ford Ford
Notes: Included with thermostat housing.
Applications: 3.5L.
Other Names: Water Outlet, Thermostat Outlet, Connection Water Outlet, rh304
Description: F-150. 2021-23. 3.5L.
Fits:
  • Ford:
    • Expedition,
    • F-150
  • Lincoln:
    • Navigator
MSRP $70.00
$48.72

Thermostat Housing Gasket

Part Number: HL3Z-8507-D
Ford Ford
Notes: Included with thermostat housing.
Other Names: Thermostat Housing O-Ring, Engine Coolant Thermostat Housing Gasket, Gasket Water Pump
Description: O-Ring. Left. 2017-20. 2021-23. 3.5L.
Fits:
  • Ford:
    • Expedition,
    • F-150,
    • GT
  • Lincoln:
    • Navigator
MSRP $21.67
$15.21
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Why Choose OEM 2021 Ford F-150 Thermostats?

OEM Fitment – Precision-engineered for a direct fit on your F-150’s cooling system

Prevents Overheating – Maintains optimal engine temperature for efficiency. 

Durable Construction – Made from high-quality materials for long-lasting reliability

Improves Efficiency – Ensures proper fuel combustion and engine longevity. 

Easy InstallationDirect bolt-on replacement with no modifications required.

Compatible 2021 Ford F-150 Models

These OEM and performance thermostats fit: 

🚙 2021 Ford F-150 XL, XLT, Lariat, King Ranch, Platinum, Limited, and Raptor models 

🚙 Compatible with 2.7L EcoBoost, 3.3L Ti-VCT V6, 3.5L EcoBoost, 5.0L V8, and 3.0L Power Stroke Diesel engines 

🚙 Designed for standard and high-performance cooling systems 

🚙 Check your engine type and cooling system to confirm correct fitment.

How to Replace a 2021 Ford F-150 Thermostat

Replacing a failing thermostat prevents engine overheating and ensures reliable cooling performance. Follow these steps for installation:

Tools Required:

✔ Coolant catch pan 

✔ Socket wrench set 

✔ Gasket scraper 

✔ Torque wrench 

✔ New coolant

Step-by-Step Installation Guide:

  1. Drain the Coolant – Place a pan under the radiator and drain the coolant.

  2. Locate the Thermostat Housing – Follow the upper radiator hose to find the housing.

  3. Remove the Old Thermostat – Unbolt the housing and take out the old thermostat.

  4. Clean the Housing Surface – Remove any gasket residue to ensure a proper seal.

  5. Install the New Thermostat – Position it correctly and secure the housing.

  6. Refill & Bleed the Cooling System – Refill with fresh coolant and remove air pockets by running the engine.

💡 Pro Tip: Always use Ford-approved coolant to maintain optimal cooling system performance.

Signs You Need to Replace Your 2021 Ford F-150 Thermostat

🚙 Engine overheating or running too cool 

🚙 Fluctuating temperature gauge while driving 

🚙 Coolant leaks near the thermostat housing 

🚙 Poor fuel efficiency due to incorrect temperature regulation 

🚙 Check Engine Light illuminated with cooling system codes

A failing thermostat can cause serious engine damage—replace it before issues arise!

2021 Ford F-150 Thermostat Options: Choosing the Right Type

🔹 OEM Replacement Thermostat – Ideal for stock cooling performance and daily driving. 

🔹 Low-Temperature Thermostat (170°F-180°F) – Designed for performance applications, towing, and extreme climates.

 🔹 High-Flow Thermostat – Allows faster coolant circulation for enhanced heat dissipation.

Popular Related Parts for 2021 Ford F-150

🔹 2021 Ford F-150 Radiator – Ensure efficient cooling with a high-quality radiator. 

🔹 2021 Ford F-150 Water Pump – Maintain proper coolant flow for temperature regulation. 

🔹 2021 Ford F-150 Coolant Temperature Sensor – Monitor accurate engine temperature readings.

Upgrade Your Ride 🚙 – Shop Now!

Keep your 2021 Ford F-150’s engine running at peak efficiency with a reliable thermostat. Order your replacement today and prevent overheating issues!

FAQs About 2021 Ford F-150 Thermostats

How long do Ford F-150 thermostats last? Most thermostats last 60,000 to 100,000 miles, but should be replaced if symptoms of failure appear.

Can I replace my F-150’s thermostat myself? Yes! With basic tools and mechanical knowledge, thermostat replacement is a manageable DIY job.

What happens if my thermostat gets stuck open or closed?

  • Stuck open – Engine runs too cool, reducing efficiency and increasing emissions.

  • Stuck closed – Engine overheats, leading to potential damage.

Do I need to flush my coolant when replacing the thermostat? Yes, replacing the thermostat is a great time to flush old coolant and refill with fresh fluid.

What temperature thermostat should I use for my F-150?

  • OEM (Stock, ~195°F) – Ideal for daily driving and factory performance.

  • Low-Temp (170°F-180°F) – Best for performance applications, off-road use, and towing.