Best Engine Thermostat Seals of 2025

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 5, 2025

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Engine thermostat seals are an essential component in maintaining the proper function of a vehicle's cooling system. These seals are responsible for keeping the engine's thermostat securely in place, preventing leaks and ensuring that the engine stays at the optimal temperature. Over time, these seals can wear out or become damaged, leading to coolant leaks and potential engine damage. It's important to replace these seals as soon as signs of wear appear, as neglecting to do so can lead to costly repairs down the line. Quality engine thermostat seals are readily available from reputable automotive suppliers, and are a simple and affordable solution to keeping a vehicle's cooling system in top condition.

At a Glance: Our Top Picks

FEL-PRO 35630 Thermostat Gasket Cover #TOP 1
FEL-PRO 35630 Thermostat Gasket
ftb score rating icon 9.9
MAHLE Original C31302 Thermostat Seal Cover #TOP 2
MAHLE Original C31302 Thermostat Seal
ftb score rating icon 9.8
MotoRad MG182EA Engine Coolant Thermostat Seal Cover #TOP 3
MotoRad MG182EA Engine Coolant Thermostat Seal
ftb score rating icon 9.6

Top 10 Engine Thermostat Seals

#TOP 1

FEL-PRO 35630 Thermostat Gasket

35630
Black
FEL-PRO 35630 Thermostat Gasket Cover
FEL-PRO 35630 Thermostat Gasket, Black

The FEL-PRO 35630 Thermostat Gasket meets or exceeds all original equipment specifications with an application specific design for a perfect fit. Engineered and manufactured specifically for the repair environment, this gasket provides unsurpassed quality you can trust, and has been validated for fit, form and function.

What We Like
Meets or exceeds original equipment specifications
Application specific design for perfect fit
Engineered and manufactured for repair environment
#TOP 2

MAHLE Original C31302 Thermostat Seal

C31302
MAHLE Original C31302 Thermostat Seal Cover
MAHLE Original C31302 Thermostat Seal

MAHLE Original C31302 Thermostat Seal is a high-quality engine seal that meets or exceeds the original equipment specifications. This seal uses OE equivalent or better materials and is designed for Domestic, Asian and European applications. The shrink-wrapped tray packaging provides added security to ensure that you have the right parts before opening the package. It has a vehicle-specific fit type.

What We Like
Meets or exceeds original equipment specifications.
Uses OE equivalent or better materials.
Vehicle specific fit type.
#TOP 3

MotoRad MG182EA Engine Coolant Thermostat Seal

MG182EA
MotoRad MG182EA Engine Coolant Thermostat Seal Cover
Motorad MG182EA Engine Coolant Thermostat Seal

The MotoRad MG182EA Engine Coolant Thermostat Seal is a high-quality product that is designed to provide increased strength and durability. With its adhesive backed gaskets, installation time is reduced and proper alignment is ensured. This thermostat seal meets or exceeds all OEM standards, guaranteeing its reliability and performance. The high-quality materials used in its construction make it long-lasting and resistant to wear and tear. The adhesive backed gaskets not only save time during installation but also ensure a proper fit, preventing any leaks that could lead to engine damage. With the MotoRad Thermostat Seal, you can be confident that your engine's cooling system will be functioning at its best.

What We Like
High quality materials
Adhesive backed gaskets
Meets or exceeds OEM standards
#TOP 4

FEL-PRO 35595 Thermostat Gasket

35595
Assorted
FEL-PRO 35595 Thermostat Gasket Cover
FEL-PRO 35595 Thermostat Gasket

The FEL-PRO 35595 Thermostat Gasket is designed to meet or exceed all original equipment specifications, ensuring a perfect fit for your engine. Engineered and manufactured specifically for the repair environment, this gasket offers unsurpassed quality and is validated for fit, form, and function. It is an application specific design that provides users with the confidence they need when repairing their engine. This thermostat gasket is a reliable product that you can trust.

What We Like
Meets or exceeds original equipment specifications
Unsurpassed quality you can trust
Application specific design ensures a perfect fit
#TOP 5

MotoRad MG38EA Thermostat Gasket

MG38EA
MotoRad MG38EA Thermostat Gasket Cover
Motorad MG38EA Engine Coolant Thermostat Housing Gasket

The MotoRad Thermostat Gasket is designed with high-quality materials, ensuring strength and durability for your engine. The adhesive backing helps you install it quickly and accurately, saving you time and effort. This feature also guarantees that the gasket aligns perfectly, reducing the risk of leaks. Plus, it meets or exceeds all original equipment manufacturer (OEM) standards, giving you peace of mind that you are using a reliable product for your vehicle. With this gasket, you can be confident in maintaining your engine's performance and longevity.

What We Like
Durable materials
Easy installation
Perfect alignment
OEM standards met
#TOP 6

MotoRad MG183EA Engine Coolant Thermostat Seal

MG183EA
MotoRad MG183EA Engine Coolant Thermostat Seal Cover
Motorad MG183EA Engine Coolant Thermostat Seal

The MotoRad Coolant Thermostat Seal is a high-quality engine part designed to ensure optimal performance and longevity. With its compact package dimensions of 0.5 L x 6 H x 6 W (inches), it is easy to install and fits seamlessly into your engine system. Weighing only 0.01 pounds, this seal is lightweight yet durable, providing a reliable solution for your engine's thermostat needs. Manufactured in China, it offers excellent quality at an affordable price. The MotoRad Coolant Thermostat Seal, part number MG183EA, is a must-have for any engine enthusiast or mechanic.

What We Like
Compact Size
Lightweight
Durable
#TOP 7

MAHLE Original Engine Coolant Thermostat Housing Gasket

C24109
Standard
MAHLE Original Engine Coolant Thermostat Housing Gasket Cover
MAHLE C24109 Engine Coolant Thermostat Housing Gasket

MAHLE Original C24109 Engine Coolant Thermostat Housing Gasket is designed to meet or exceed the original equipment specifications, providing excellent sealing. This gasket uses OE equivalent or better materials, making it an ideal choice for Domestic, Asian and European applications. The package includes shrink wrapped tray, ensuring the right parts are delivered to you.

What We Like
Meets or exceeds OE specifications
Uses OE equivalent or better materials
Suitable for Domestic, Asian and European applications
#TOP 8

Beck/Arnley 039-0104 Thermostat Gasket

039-0104
Black
Beck/Arnley 039-0104 Thermostat Gasket Cover
Beck/Arnley Thermostat Gasket - 039-0104

The Beck/Arnley Thermostat Gasket is designed to meet original equipment specifications, ensuring it fits your vehicle perfectly. Made from high-quality rubber or composite material, it stands up to extreme heat, providing reliable performance. Its durable construction means you can count on it for long-lasting use. Additionally, the gasket comes packaged in clear plastic, making it easy for you to see and identify all components at a glance. This combination of features offers you peace of mind and convenience when replacing your thermostat gasket.

What We Like
Perfect fit for vehicles
High heat resistance
Durable construction
Clear packaging for easy access
#TOP 9

MAHLE C31207 Coolant Thermostat Gasket

C31207
MAHLE C31207 Coolant Thermostat Gasket Cover
MAHLE Original C31207 Engine Coolant Thermostat Gasket

The MAHLE C31207 Engine Coolant Thermostat Gasket is a high-quality replacement part that meets or exceeds original equipment specifications. It utilizes OE equivalent or better materials and is suitable for domestic, Asian, and European applications. The gasket is packaged in a shrink-wrapped tray for added security, allowing you to verify the contents before opening the package.

What We Like
Meets or exceeds original equipment specifications
Uses OE equivalent or better materials
Suitable for domestic, Asian, and European applications
#TOP 10

Gates Engine Coolant Thermostat Seal 33609

33609
Gates Engine Coolant Thermostat Seal 33609 Cover
Gates 33609 Engine Coolant Thermostat Seal

The Gates Thermostat Seal is a crucial auto part designed to ensure your engine operates efficiently. With dimensions of 7.0 inches in length and 6.0 inches in width, it fits easily into various applications, making installation straightforward for users. Weighing only 0.06 lbs, it is lightweight, which can help reduce overall vehicle weight and improve fuel efficiency. The package includes one seal, providing you with everything needed for a replacement. This high-quality seal from Gates is ideal for maintaining optimal engine temperature, helping to prevent overheating and prolonging the life of your engine.

What We Like
Lightweight design
Easy installation
Maintains optimal engine temperature
High-quality construction
Buying Guide Image

How to Choose the Best Engine Thermostat Seals for Your Car

What are Engine Thermostat Seals and Why are They Important?

Engine thermostat seals are a crucial part of your vehicle's cooling system. These seals help to regulate the flow of coolant, ensuring that your engine operates at the optimal temperature for maximum performance and efficiency. Without properly functioning thermostat seals, your engine may overheat, causing damage and reducing its overall lifespan.

How to Choose the Right Engine Thermostat Seals

When it comes to choosing engine thermostat seals, there are a few key factors to consider. First, you'll want to make sure that the seals you choose are compatible with your make and model of vehicle. This information can usually be found in your vehicle's owner's manual, or by consulting with a trusted mechanic.

Next, consider the quality of the seals you're purchasing. Look for seals made from high-quality materials that are designed to withstand the heat and pressure of your engine. Avoid cheap, generic seals, as these may not provide the same level of protection and performance.

Finally, consider the reputation of the manufacturer. Choose seals from a well-known, reputable brand to ensure that you're getting a product that has been tested and proven to be effective.

Tips for Installing Engine Thermostat Seals

Installing engine thermostat seals can be a challenging task, especially for those who are not experienced with automotive maintenance. Here are a few tips to help you through the process:

  • Be sure to read and understand the instructions provided by the manufacturer. This will help you to properly install the seals and avoid damaging your engine.

  • Before beginning the installation, be sure to let your engine cool down completely. Working on a hot engine can be dangerous and may cause further damage.

  • Gather all of the tools and materials you'll need before beginning the installation. This will save you time and frustration during the process.

  • Take your time and work carefully. It's better to take a little extra time and do the job right than to rush and potentially cause damage to your engine.

Conclusion

Choosing the right engine thermostat seals is essential for the proper functioning and longevity of your vehicle's cooling system. By considering compatibility, quality, and reputation, you can ensure that you're getting the best seals for your vehicle. And by following the tips provided above, you can successfully install these seals and keep your engine running smoothly.

Frequently Asked Questions (FAQs)

1. What is the seal for the thermostat for?

The seal for the thermostat, such as O-rings and seals, is crucial for providing an effective seal when mounting the thermostat into the housing. It helps prevent leaks in the coolant system, which can lead to serious issues like engines running under or over temperature.

2. Do you need gasket seal for thermostat?

No, gasket sealer is not typically required for thermostats. Thermostats usually come with an O-ring, and water pumps come with a paper-like gasket. As long as these supplied O-ring and gasket are used as instructed, gasket sealant should not be necessary.

3. How do I know if my thermostat is leaking?

Signs of a leaking thermostat include a temperature gauge reading unusually high, engine overheating, erratic temperature changes, and coolant leaking around the thermostat housing or under the vehicle.

4. Can you drive with a bad thermostat gasket?

Driving with a bad thermostat is not recommended. While the vehicle may still be able to move, operating it with a bad thermostat can lead to further damage, especially if the engine overheats. It's best to address the issue and replace the thermostat gasket before driving.

5. Can a thermostat seal cause a leak?

A failed or bad thermostat can contribute to vehicle overheating. However, a coolant leak is more likely caused by a failed seal in the engine or a warped thermostat housing. If you notice a coolant leak, it's important to address the issue and inspect the thermostat and housing for any damage.

6. Can I drive my car with a leaking thermostat?

It is not recommended to drive a car with a leaking thermostat. A severe leak can reduce the coolant level in the engine, leading to temperature problems. Adding coolant may temporarily alleviate the issue, but it will continue to leak out. It's best to avoid driving the car and have the thermostat and coolant system inspected and repaired.

Editor's Notes

During our engine thermostat seal research, we found 24 engine thermostat seal products and shortlisted 10 quality products. We collected and analyzed 9,420 customer reviews through our big data system to write the engine thermostat seals list. We found that most customers choose engine thermostat seals with an average price of $5.16.

The engine thermostat seals are available for purchase. We have researched hundreds of brands and picked the top brands of engine thermostat seals, including Fel-Pro, MAHLE, MotoRad, Beck/Arnley, Gates. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.