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Updated: 06 Apr 2026

10 Best Thermostat Housing Caps

#1 Best Pick
Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering

Honeywell CG512A1009 Large Thermostat Guard with Inner Shelf to Prevent Tampering

Brand: Honeywell Home
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  • Fits all Honeywell and most other thermostats
  • Clear plastic cover that resists yellowing
  • Key lock with inner shelf to prevent tampering
  • Protects unwanted changes to AC/Heating preferred settings
  • Ultra clear acrylic resin cover and base resists the yellowing effects of chemicals and UV-light
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#2 Best Value
Autotecnica Thermostat Housing Cover Premium Aluminum Construction vs plastic OE

Autotecnica Thermostat Housing Cover Premium Aluminum Construction vs plastic OE

Brand: Autotecnica
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  • Lexus HS250h 10-12 Toyota Camry 02-11, Corolla 09-13, Highlander 01-07, Matrix 09-13, RAV4 06-08, Solara 02-08 Scion xB 11-15
  • Made from high strength aluminum vs plastic OEM
  • High-strength alloy construction withstands brutal engine heat and vibration
  • Durable surface finish resists corrosion
  • Limited Lifetime / Unlimited Mileage Warranty"
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#3 Budget Pick
URO Parts 055 121 121F Thermostat Housing Cover

URO Parts 055 121 121F Thermostat Housing Cover

Brand: URO Parts
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  • Guaranteed Fitment
  • 24 Month Unlimited Mileage
  • High Quality Materials
  • Heat cycling and cooling system pressure can embrittle and rupture thermostat housing covers and seals
  • URO thermostat housing covers are manufactured to OE dimensions for easy bolt-on installation and reliable coolant connections.High-quality alloy or composite material resists flange warping and cracking that can lead to rapid loss of coolant and overheating.Includes temperature sensor or bleed ports where applicable.24-Month / Unlimited Mileage
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#4 Top Choice
Autotecnica Thermostat Housing Cover Premium Aluminum Construction vs OE Plastic

Autotecnica Thermostat Housing Cover Premium Aluminum Construction vs OE Plastic

Brand: Autotecnica
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#5 Popular Choice
NICECNC Thermostat Housing Cover, Compatible with Husqvarna Norden 901 / Expedition 2022-2024, 790 890 Duke/R 2018-2024, Water Pipe Fitting, Replacement for 63535019000, 63535019200, See Fit,

NICECNC Thermostat Housing Cover, Compatible with Husqvarna Norden 901 / Expedition 2022-2024, 790 890 Duke/R 2018-2024, Water Pipe Fitting, Replacement for 63535019000, 63535019200, See Fit,

Brand: NICECNC
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  • HEAVY DUTY ALUMINUM CONSTRUCTION Made of high-strength aluminum, this product provides excellent durability compared to MPN plastic components, ensuring long lasting use and wear resistance.
  • HEAT RESISTANCE Designed to withstand prolonged exposure to high temperatures without warping or deforming, providing reliable performance even in extreme conditions.
  • PRECISE FIT Precision engineered for a seamless fit, this component is engineered to effortlessly replace existing parts to ensure compatibility and optimal function.
  • STABLE PERFORMANCE Designed to minimize the risk of leaks or damage, this part ensures stable and reliable performance and improves the reliability of your vehicle.
  • Wide compatibility: compatible with Husqvarna Norden 901 (Expedition and Standard) 2022-2024, 790 Duke 2018-2020 and 2023-2024, 890 Duke 2021-2022, 890 Duke GP 2022-2023 and 890 Duke GP 2022-2023 and 8. 90 Du. ke R and R GP 2020-2023, offers versatile applications.
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#6 Top Pick
Auto parts Compatible With Jaguar For S-Type 3.0L V6 2002 2003 2004 2005 2006 2007 2008 1x AJ81766 AJ813558 Engine Coolant Thermostat Cap Cover Assembly

Auto parts Compatible With Jaguar For S-Type 3.0L V6 2002 2003 2004 2005 2006 2007 2008 1x AJ81766 AJ813558 Engine Coolant Thermostat Cap Cover Assembly

Brand: Generic
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  • 🚗Superior Materials: The engine coolant thermostat is made of high-quality materials, ensuring a rapid response to coolant temperature changes, reliable quality, stable performance, and durability.
  • 🚗Efficient Temperature Control: Improved temperature control keeps the engine at its optimal operating temperature, thereby enhancing performance.
  • 🚗Reliable Performance: By properly regulating coolant circulation, the thermostat helps maintain long-term stable engine operation, reducing maintenance costs and improving vehicle reliability and durability.
  • 🚗Effective Control: The coolant thermostat effectively controls engine temperature, preventing overcooling and improving engine operating efficiency.
  • 🚗Excellent After-Sales Service: Each product has undergone durability and compatibility testing. For any questions or assistance, we offer standard after-sales service to ensure you have the best possible shopping experience.
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#7 Top Pick
OVAQUIXI Thermostat Cover, Aluminum Car Engine Coolant Thermostat Housing Cover with Gasket for M3 Z3 E34 E36 11531722531 11531740437

OVAQUIXI Thermostat Cover, Aluminum Car Engine Coolant Thermostat Housing Cover with Gasket for M3 Z3 E34 E36 11531722531 11531740437

Brand: OVAQUIXI
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  • The replacing OEM numbers for reference- 11531740437, 11531722531.
  • Fit for- Car thermostat housing corver is compaible for M3 Z3 E34 E36.
  • material- Designed and developed with superior aluminum alloy material, resistant to scratches, rust, and corrosion.
  • Easy to install and use-comes with thermostat housing cover and gasket. Original standards, perfect match with original cars. Replace your old or damaged ones directly and put them in directly.
  • Quality Assurance- Worry-free refund service. Please feel free to contact us if you meetany trouble in using our product.
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#8 Top Pick
ACDelco 15544596 GM Original Equipment Engine Coolant Thermostat Housing Cap

ACDelco 15544596 GM Original Equipment Engine Coolant Thermostat Housing Cap

Brand: GM GENUINE PARTS
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  • Leading Manufacturer Of High-Quality Products
  • International Renown For Our Diverse Range Of Award-Winning Products
  • Fully Equipped With State-Of-The-Art Technology
  • All Products Have Been Designed With The Professional In Mind
  • Constantly Modernizing Our Powerful Devices To Meet The Demands Of The Modern User
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#9 Top Pick
URO Parts NCA2270AC Thermostat Housing Cap

URO Parts NCA2270AC Thermostat Housing Cap

Brand: URO Parts
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  • Fit type: Vehicle Specific
  • Package Dimensions: 13.208 L x 2.032 H x 9.652 W (centimeters)
  • Made in China
  • Package Weight : 0.1 pounds
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#10 Top Pick
URO Parts 11531486703 Thermostat Housing Cap

URO Parts 11531486703 Thermostat Housing Cap

Brand: URO Parts
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  • Guaranteed fitment
  • Replace your worn or cracked thermostat housing cap to prevent coolant leaks
  • Direct-fit OE replacement cap design is easy to install
  • High-quality materials resists high heat and engine vibration
  • 24 Month Unlimited Mileage Warranty
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