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If you own a 2018-2022 Honda Accord, the thermostat is a small component that has a big effect on engine performance and cabin comfort. A thermostat that sticks, leaks, or opens at the wrong temperature can cause overheating, cold running, poor heater output, or higher fuel use. This guide focuses on thermostats suitable for the 2018-2022 Accord and explains why correct fit and a good seal matter for long-term reliability.Below are the top shortlisted thermostats for this Accord generation, selected for proper fitment, material quality, and expected service life. We also cover the symptoms to watch for, how thermostats are tested, and practical installation and sealing tips to help you pick the right replacement for routine maintenance or repair.
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Top Picks at a Glance
| Best Overall The best all-around choice for most situations | PartCatalog Engine Coolant Thermostat Housing Assembly for Honda Accord 2018–2022 |  |
| Best Quality Built to a higher standard if you want something more solid | CTGTREXS 78°C Engine Coolant Thermostat Housing Assembly |  |
| Best Value The sweet spot between price and what you get | A-Premium Engine Coolant Thermostat for Honda Accord & CR-V 2.0L (2018–2024) |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium Engine Coolant Thermostat for Honda Accord & CR-V 2.0L (2018-2024) |  |
| Highest Rated A top-rated pick with lots of positive feedback | A-Premium Engine Coolant Thermostat Housing Assembly for Honda Accord 2018–2022 |  |
| Most Popular A crowd favorite that many people choose with confidence | Rendrox 78°C Thermostat Housing Assembly, Direct Replacement |  |
1. PartCatalog Engine Coolant Thermostat Housing Assembly for Honda Accord 2018–2022
| Model | Engine Coolant Thermostat Housing Assembly |
|---|---|
| Manufacturer | PartCatalog |
| Exterior | unpainted |
This thermostat housing assembly replaces the factory unit on 2018–2022 Honda Accord 2.0L models and is sold as a complete coolant thermostat housing. It is intended for use when the original housing is cracked, leaking, or the thermostat has failed; installation follows the same points as the factory part for a straightforward swap. The listing emphasizes factory-quality fit and performance, which should reduce the need for modification or additional parts during installation. Because it is an assembled housing, it can save time compared with sourcing a separate thermostat and housing. Practical benefits include a direct replacement fit and a finished exterior ready for install. Limitations are that the listing does not specify the included thermostat temperature rating or gasket details, and buyers should verify the fitment chart images for exact vehicle compatibility before ordering.
Best for: Buyers who want a straightforward, factory-style replacement for a leaking or damaged thermostat housing on a 2018–2022 Accord 2.0L and prefer a part that aims to match original fit and function.
Less Ideal for: Drivers seeking performance thermostats with different open temperatures or a fully finished painted appearance should consider alternative aftermarket options.
- Made to factory specifications for a direct fit to 2018–2022 Honda Accord 2.0L
- Supplied as a complete housing assembly to simplify installation
- Sold by a specialist replacement parts brand focused on engine cooling components
- Listing does not state thermostat temperature rating or whether gasket/seals are included
- Exterior arrives unpainted which may require preparation for appearance-focused installs
Verdict: Choose this assembled thermostat housing when you want a direct, factory-style replacement for a 2018–2022 Accord 2.0L to simplify installation and restore cooling-system reliability.
2. CTGTREXS 78°C Engine Coolant Thermostat Housing Assembly
| Type | 78°C Engine Coolant Thermostat Housing Assembly |
|---|---|
| Replace Part Number | 19310-6A0-A01, 193106A0A01, THH019 |
| Fitment | Accord 2018-2022, Civic 2016-2024, CR-V 2017-2024, Integra 2023-2024 1.5L Turbo |
| Exterior | Machined |
This CTGTREXS thermostat housing assembly replaces Honda part 19310-6A0-A01 and is calibrated to open at 78°C to keep the 1.5L turbo engines in the correct temperature band. It installs in place of the factory housing and is used to control coolant flow so the engine reaches and maintains its designed operating temperature, which helps avoid both overheating and running too cool. The listing highlights a machined exterior and materials specified to resist cracking and leakage from repeated thermal cycling, which is important for durability on turbocharged small-displacement engines. Fitment is limited to 1.5L turbo variants of the Accord, Civic, CR-V and Acura Integra for the stated years, so it is suitable when replacing a failed housing or when restoring proper thermostat calibration after other cooling repairs. Buyers should note this is a direct replacement part rather than an adjustable performance thermostat, so it changes thermal behavior only by replacing the housing and thermostat to the 78°C spec rather than offering tunable temperatures.
Best for: Drivers who prioritize consistent engine temperature control on 1.5L turbo Hondas and Acuras and need a reliable factory-replacement housing after a failure or cooling-system repair.
Less Ideal for: People looking to lower or raise thermostat opening points for track tuning or custom performance cooling should choose an adjustable or performance thermostat instead.
- Calibrated to open at 78°C for stable engine operating temperature
- Machined exterior and construction intended to resist cracking and leaks under thermal stress
- Direct fit replacement for specified 1.5L turbo Honda and Acura models for straightforward installation
- Includes thermostat housing assembly in one package for a complete swap
- Not an adjustable or performance-grade thermostat for custom temperature tuning
Verdict: Choose this 78°C factory-replacement thermostat housing when you need a durable, direct-fit part to restore correct operating temperature on 1.5L turbo Honda and Acura models.
3. A-Premium Engine Coolant Thermostat for Honda Accord & CR-V 2.0L (2018–2024)
| Fitment | Accord 2018-2024 L4 2.0L; CR-V 2020-2024 L4 2.0L |
|---|---|
| Start to Open Temperature | 82°C |
| Gasket Included | No |
| Material | Metal |
| Package Quantity | 1 |
This A-Premium thermostat replaces the factory thermostat on naturally aspirated 2.0L Honda Accord (2018–2024) and CR-V (2020–2024) models to control coolant flow and maintain proper engine operating temperature. It opens at 82°C and is made from metal for basic durability; installation is a direct swap for compatible engines and typically involves removing the housing, swapping the unit, and refilling the cooling system. The product ships as a single thermostat without a gasket or seal, so plan to reuse the factory gasket if it is serviceable or purchase a new one to ensure a leak-free installation. The unit is pitched as a budget replacement with a one-year unlimited-mileage guarantee. Expect practical temperature regulation similar to a factory part, but note the limited fitment to naturally aspirated 2.0L engines and the lack of included sealing hardware means an extra part or careful gasket reuse is often needed during installation.
Best for: Buyers who prioritize a straightforward, budget-conscious replacement to restore correct engine temperature control on compatible naturally aspirated 2.0L Hondas and who are comfortable sourcing or reusing sealing hardware during installation.
Less Ideal for: Drivers with turbocharged engines, different displacements, or those who want a replacement that includes all installation seals and hardware out of the box.
- Direct-fit replacement for naturally aspirated 2.0L Honda Accord (2018–2024) and CR-V (2020–2024).
- Metal construction intended for basic durability and consistent temperature control.
- Opens at a defined 82°C setpoint for predictable engine warm-up behavior.
- Sold as a single unit suitable for straightforward DIY replacement.
- No gasket or seal included, so an additional part or reuse of the old gasket is required.
- Not compatible with turbocharged variants or other engine displacements.
Verdict: A practical, low-cost direct replacement thermostat for naturally aspirated 2.0L Honda Accord and CR-V owners who need reliable temperature control and can supply or reuse a gasket.
4. A-Premium Engine Coolant Thermostat for Honda Accord & CR-V 2.0L (2018-2024)
| Start to Open Temperature | 82°C |
|---|---|
| Material | Metal |
| Package Quantity | 1 |
This A-Premium thermostat is a straightforward factory-style replacement for naturally aspirated 2.0L Honda Accord and CR-V applications. It replaces the vehicle thermostat to regulate engine temperature and begins to open at 82°C, which helps the cooling system maintain normal operating range. The unit is metal construction and comes as a single packaged item without a gasket, so you may want to reuse the factory seal or install a new one when replacing it. Typical use is direct swap-in during routine cooling system service or when a failing thermostat causes overheating or poor heater performance. The part is presented as a budget-focused option with basic quality control and a one-year unlimited-mileage guarantee. Practical benefits are simple fitment for the listed naturally aspirated engines and an opening temperature matched to factory expectations; limitations are the lack of an included gasket and that it is not compatible with turbocharged variants. For a do-it-yourself owner or a technician replacing a tired thermostat on a budget, this covers the essential function without premium extras.
Best for: Buyers looking for an affordable, no-frills replacement thermostat for routine cooling system repair on naturally aspirated 2.0L Honda Accord or CR-V engines.
Less Ideal for: Drivers seeking a premium performance thermostat with altered opening temperatures or those needing parts for turbocharged engine models should consider other options.
- Designed to fit naturally aspirated 2.0L Honda Accord (2018–2024) and CR-V (2020–2024) applications
- Opens at 82°C, aligning with typical factory temperature control
- Metal construction aimed at durable, long-lasting operation
- Comes with a one-year unlimited-mileage guarantee
- Does not include a gasket or seal, requiring reuse or separate purchase
- Not compatible with turbocharged engine variants
Verdict: A practical, budget-friendly replacement thermostat that restores proper temperature control for naturally aspirated 2.0L Honda Accord and CR-V engines.
5. A-Premium Engine Coolant Thermostat Housing Assembly for Honda Accord 2018–2022
| Compatible Vehicles | Honda Accord 2018 2019 2020 2021 2022 L4 1.5L |
|---|---|
| Thermostat opening | 78°C |
| Manufacturer part number | APTHA0322 |
| OEM reference | THH019 |
This A-Premium thermostat housing assembly combines the thermostat and housing into a single replacement unit for Honda Accord 2018–2022 1.5L engines. It installs in the cooling system where the factory thermostat normally sits and regulates coolant flow around the 78°C opening temperature specified by the manufacturer. The integrated design simplifies installation compared with separate thermostat-and-housing swaps and reduces the number of parts that can leak. The listing emphasizes durability claims and shows multiple product images and an installation video that help confirm fit and orientation before you start work. It comes with a one-year unlimited-mileage guarantee from the brand, which provides extra confidence for routine driving. Be aware this is a direct replacement part for a specific 1.5L Accord application so fitment must be verified against the reference numbers; buyers who need different valve temperatures or that prefer OEM-branded parts may want to compare options first.
Best for: Buyers who prioritize a dependable, ready-to-install replacement that restores proper cooling control on 2018–2022 Accords and prefer a straightforward swap with supporting fitment media and a warranty.
Less Ideal for: Drivers seeking an OEM-branded part or an alternative thermostat with a different opening temperature should consider other options.
- Integrated thermostat and housing reduces assembly complexity and potential leak points
- Thermostat calibrated to a 78°C opening temperature to maintain proper engine operating range
- Multiple product images and an installation video help confirm fit and simplify installation
- One-year unlimited-mileage guarantee from the brand adds post-purchase reassurance
- Aftermarket brand may differ in fit or finish compared with factory replacement parts
Verdict: A practical, warranty-backed integrated thermostat housing built to replace the factory unit and simplify cooling system repairs on 2018–2022 Honda Accord 1.5L models.
6. Rendrox 78°C Thermostat Housing Assembly, Direct Replacement
| Opening temperature | 78°C |
|---|---|
| Compatible engines | 1.5L turbo L4 (listed Honda/Acura models) |
| Replacement part numbers | 19310-6A0-A01, 193106A0A01, THH019 |
| Brand | Rendrox |
This thermostat housing assembly replaces the factory unit and restores the cooling system on compatible 1.5L turbo Honda engines. It is a direct-fit replacement for the listed part numbers and is intended for plug-and-play installation with the original cooling plumbing. The unit is calibrated to open at 78°C, so it will return thermostat operation to the factory opening point when the stock unit has failed. Rendrox highlights high-strength materials and hardness testing to reduce the chance of cracking around pipe connections or gasket surfaces, which helps maintain a leak-free seal once installed. Typical use is straightforward: remove the old housing, transfer any sensors or fittings, and bolt this housing in its place while replacing gasket or O-ring as needed. Limitations to note are that fitment is specific to the stated Accord model years and other compatible models, so verify the part number before buying, and you should follow factory torque and replacement gasket practice to avoid installation issues.
Best for: Buyers who want a drop-in replacement to restore proper thermostat operation on affected 1.5L turbo Honda vehicles and prefer parts that match factory opening temperature and fit.
Less Ideal for: Do not choose this if you need a performance or altered-temperature thermostat or if your vehicle is outside the listed model years and engine configuration.
- Direct replacement for specified 19310-6A0-A01 / 193106A0A01 part numbers for easy fit
- Calibrated 78°C opening temperature to match factory thermostat behavior
- Constructed from high-strength materials and tested for hardness to resist cracking
- Designed for plug-and-play installation to restore cooling system function quickly
- Compatibility limited to specified 1.5L turbo Honda/Acura models and years so not universal
- Manufacturer details do not include a stated warranty period in the listing
Verdict: A factory-temperature, direct-fit replacement housing aimed at quickly restoring cooling system function on the specified 1.5L turbo Honda models.
Choosing the Right 2018-2022 Honda Accord Thermostat: Key Factors to Consider
Correct Opening Temperature
The thermostat's rated opening temperature determines when coolant begins circulating through the radiator. For the 2018-2022 Accord, a thermostat that opens too early can cause the engine to run cold, harming fuel economy and cabin heat. One that opens too late risks overheating and elevated cooling-system pressure.
Tolerance around the nominal temperature matters because manufacturing variance affects real-world behavior. Look for thermostats with tight temperature specifications and documented test methods so you know how they will behave under normal driving and heavy-load conditions.
Fitment And Seal Compatibility
Accurate fitment to the factory thermostat housing prevents leaks and reduces installation headaches. The part must sit flush in the housing, align with bolt holes, and match the seal or gasket type used by the Accord. Improper fit can lead to coolant loss, air ingress, or a persistent thermostat housing seal leak.
Check whether the replacement uses the same flange geometry and sealing surface finish as the factory component. If an O-ring or rubberized gasket is required, ensure it is included or that a proper OEM-style seal will be used during installation.
Material Durability And Corrosion Resistance
Thermostat components are exposed to coolant chemistry and temperature cycles. Materials that resist corrosion and pitting maintain valve movement over time, preventing the thermostat from sticking closed or open. Stainless steel, brass, and high-quality springs typically outlast lower-grade metals and plastic parts.
Consider how the thermostat will react to common coolant mixes and additives. Durable materials reduce the chance of failure that can cause sudden overheating or the engine running cold thermostat stuck open condition.
Valve And Spring Design
The valve and spring determine how cleanly the thermostat modulates flow as the engine warms. A robust spring provides predictable closing and opening behavior, while the valve seating surface should form a reliable seal at low temperatures.
Designs that include a secondary bleed or calibrated bypass can improve warm-up control and reduce cold soaking. Evaluate whether the valve assembly is constructed to resist sticking from scale, debris, or coolant degradation over typical service intervals.
Gasket And Housing Interaction
A thermostat's sealing system is only as good as its mating gasket and housing. Reusing an old gasket or failing to inspect the housing surface can cause leaks even with a new thermostat. The Accord's thermostat flange should be inspected for warpage or corrosion before installation.
Use correct torque and a fresh gasket or OEM-style O-ring to ensure a durable seal. Some thermostats come with higher-quality gaskets that compress evenly and resist coolant exposure better than generic replacements.
Serviceability And Replacement Procedure
Consider how easy the thermostat is to replace during routine maintenance. Units that integrate with simple housings and use common fasteners reduce labor time and the chance of installation error. Parts that require special tools or additional disassembly increase complexity and risk.
Also factor in accessibility to the thermostat housing on the 2018-2022 Accord engine. Choose a design that allows for straightforward gasket replacement and clear bleed points to remove trapped air after installation.
Common Thermostat Failure Symptoms
Recognizing early signs of thermostat trouble helps prevent more serious engine damage. Typical symptoms include temperature gauge fluctuation, slow or no cabin heat, and unexplained coolant loss. Overheating under load or at idle often points to a thermostat that is sticking closed.
Conversely, if the engine takes a long time to reach operating temperature or the heater never gets warm, the thermostat may be stuck open. Watch for the check engine light triggered by temperature-related sensors and for coolant pooling around the housing or lower radiator hose.
- Rapid temperature spikes when idling
- Engine running cold and poor heater output
- Visible coolant leak around the thermostat housing seal
- White steam or coolant smell from the engine bay
How Mechanics Test A Thermostat
Professionals use both bench tests and in-vehicle checks to determine thermostat condition. A bench test involves heating the thermostat in water and observing the valve opening at the specified temperature. This confirms whether the unit opens at the expected temperature and whether it moves smoothly.
In the vehicle, technicians monitor coolant temperature rise, heater performance, and radiator inlet temperature to see if flow begins at the right time. Pressure testing the cooling system and inspecting the thermostat housing for leaks are also common steps.
- Bench water-bath opening temperature check
- In-vehicle warm-up and radiator inlet temperature comparison
- Cooling system pressure test and visual housing inspection
Installation Tips To Avoid Leaks
Preventing a thermostat housing seal leak starts with a clean mating surface and a new gasket or O-ring. Remove old gasket material carefully and check the housing for pitting or warpage. Use manufacturer-recommended torque values on housing bolts to avoid deforming the flange.
Always refill the cooling system using the correct coolant mixture and bleed trapped air through the specified bleed points. After installation, run the engine to operating temperature and recheck the housing and hoses for signs of seepage.
- Clean flange surfaces and replace the gasket
- Use correct bolt torque sequence
- Bleed the cooling system to remove trapped air
Maintenance Intervals And Preventive Replacement
Thermostats are often replaced as part of scheduled cooling-system service or when replacing the water pump or hoses. On the 2018-2022 Accord, consider inspecting the thermostat during major coolant services and replace it if there are signs of wear or if the service history is unknown.
Proactive replacement can prevent roadside breakdowns caused by overheating or the engine running cold thermostat stuck open fault. If the vehicle is approaching high mileage or has had coolant contamination, treating the thermostat as a wear item reduces long-term risk.
- Inspect thermostat during coolant flush or water pump service
- Replace if coolant shows signs of contamination or corrosion
- Consider preventive replacement at high mileage or persistent temperature issues
Thermostat Housing And Associated Parts To Check
When replacing the thermostat, inspect the housing, gasket surfaces, thermostat housing bolts, and connecting hoses. A compromised hose or corroded housing can undermine a new thermostat's sealing and function. Replace any brittle hoses and clean the mating surfaces thoroughly.
Also check the condition of nearby sensors and temperature sender threads to ensure they seat properly and do not introduce leaks. Tighten electrical connectors and inspect clamps on radiator and heater hoses that could cause pressure-related seepage.
- Inspect hoses for age-related cracking
- Check sensor threads and sealing surfaces
- Replace worn clamps to ensure secure connections
Choosing The Right Replacement Part Number
Accurate thermostat part number fitment is essential to ensure correct opening temperature and flange geometry for the 2018-2022 Accord. Match the replacement to the vehicle's engine and production range when checking part references to avoid compatibility issues.
If in doubt, confirm the part number with the vehicle VIN or engine code before purchase to ensure the valve temperature and sealing interface correspond to the factory specification.
- Verify part number against VIN or engine code
- Confirm opening temperature spec and flange design
- Avoid universal thermostats that require modification
Still looking for the perfect fit?
Select your Honda Accord configuration to see the most relevant Thermostats recommendations
How We Chose the Best 2018-2022 Honda Accord Thermostat
We prioritized thermostats that match the 2018-2022 Honda Accord's cooling system requirements and the common service needs for this generation. Selection criteria included: correct valve opening temperature and tolerance for the Accord's engine, OEM-equivalent or improved fitment to the factory housing, construction materials that resist corrosion and sticking, and design features that reduce the risk of seal leaks. Durability considerations included spring and valve materials, thermally stable components, and resistance to coolant additives.We also evaluated ease of installation, including whether the thermostat integrates cleanly with the factory housing and cooling lines, and whether common gaskets or O-rings are used to simplify replacement. Heat-transfer characteristics and how quickly a thermostat reaches operating temperature were assessed to avoid prolonged cold running or delayed warm-up.Excluded items: thermostatic housing assemblies with major redesigns, universal or non-specific thermostats that require machining or modification, and units lacking documented temperature specs. Practical fitment, leak prevention, and consistent opening behavior were the decisive factors for inclusion.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the signs of a bad thermostat in my 2018-2022 Accord?
Common signs include overheating at idle or under load, the temperature gauge fluctuating, poor cabin heat, and coolant leaking around the housing. The engine running cold despite normal operation can indicate a thermostat stuck open.
How long does a thermostat typically last on this Accord generation?
Thermostat life varies with coolant quality and driving conditions, but many last the length of typical cooling-system intervals. Corroded coolant or severe temperature cycling can shorten service life, so inspect the thermostat during major coolant services.
Can I test the thermostat without removing it from the car?
You can perform in-vehicle checks by monitoring warm-up behavior, heater performance, and radiator inlet temperature. A definitive bench test requires removal and heating the thermostat in water to observe the opening temperature.
Will replacing the gasket fix a minor thermostat housing leak?
If the housing surface is clean and undamaged, replacing the gasket or O-ring can stop minor leaks. However, if the flange is corroded or warped, the housing may need repair or replacement to ensure a reliable seal.
Should I replace the thermostat when I change the water pump or coolant?
It is often practical to replace the thermostat during water pump or coolant service since the system is already drained and accessible. Doing so can prevent future failures and reduce labor if the thermostat later needs service.
How do I know the thermostat opening temperature is correct for my Accord?
Confirm the replacement thermostat's rated opening temperature against the vehicle's factory specification for the 2018-2022 Accord. Bench testing and vendor documentation that lists the opening point and tolerance provide the best assurance of correct behavior.
Final Verdict
Prioritize thermostats that match the 2018-2022 Honda Accord's specified opening temperature and that offer reliable sealing with the factory housing. Focus on durable materials, accurate valve and spring behavior, and proper gasket fitment to avoid leaks and temperature control issues. Balance ease of installation and serviceability against longevity: a properly fitting, well-constructed thermostat reduces the chances of overheating or cold-running problems and delivers dependable performance over time.
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