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If you own a Chrysler 300, a properly functioning thermostat is essential to keep engine temperature in the optimal range and to prevent overheating or inefficient warming. Choosing the right Chrysler 300 thermostat affects warm-up times, heater performance, and long-term engine health. This guide covers the top shortlisted thermostats for the Chrysler 300 and explains the evaluation criteria used to pick them, including fitment accuracy and temperature control. Read on to find which options match your needs and driving conditions.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | MOTOKU Thermostat Housing for Chrysler 300 3.6 (2011–2023) |  |
| Most Popular A crowd favorite that many people choose with confidence | WMPHE Aluminum Engine Coolant Thermostat Housing Assembly |  |
| Best Quality Built to a higher standard if you want something more solid | Torquizo Aluminum Coolant Thermostat Housing Assembly |  |
| Best Budget The cheapest option that still gets the job done reliably | OCPTY Thermostat Housing Assembly for Chrysler 300 and Compatible Dodge Models |  |
| Most Sold A high-volume bestseller chosen again and again | JXGZYD Engine Thermostat 203°F Replacement for Chrysler 300 and Related V8 Models |  |
| Best Value for Money The sweet spot between price and what you get | Allmotorparts Thermostat Housing Replacement for Chrysler/Dodge/Jeep 5.7L–6.4L Hemi |  |
| Best Overall The best all-around choice for most situations | BDFHYK Aluminium Coolant Thermostat Housing Assembly for Chrysler 300 and Dodge Challenger/Charger 3.6L |  |
1. MOTOKU Thermostat Housing for Chrysler 300 3.6 (2011–2023)
| Fitment | Chrysler 300 3.6 2011-2023; Dodge Charger/Challenger 3.6 2011-2023 |
|---|---|
| Brand | MOTOKU |
| Manufacturer Part Number | 5184977AC |
This MOTOKU thermostat housing replaces the factory unit on 3.6L Pentastar V6 Chrysler 300s and like-model Dodge Chargers and Challengers from 2011 through 2023. It is a bolt-on housing that directs coolant between the engine and the thermostat assembly, used when the original housing is cracked, leaking, or causing temperature control faults. The listing shows factory-style mounting points and reviewers report accurate fitment and straightforward installation with no modifications required. For a reliability-minded owner this housing provides a cost-effective way to eliminate leaks and restore proper coolant flow, and several users note it has lasted months to a year without issues. Limitations are typical for aftermarket housings: long-term durability compared with higher-end branded OE replacements is still based on user reports rather than a formal warranty, and you should pair it with a new thermostat and proper seals to avoid future leaks.
Best for: Reliability-focused owners who prioritize restoring correct coolant control on a Chrysler 300 3.6 and want a straightforward, OEM-style replacement without expensive dealer parts.
Less Ideal for: Buyers seeking a comprehensive kit with thermostat and seals included or those who prefer parts backed by a documented factory warranty should consider alternatives.
- Direct-fit design for Chrysler 300 3.6L and matching Dodge models for 2011–2023, reducing installation hassle
- Appears to use factory-style mounting locations for consistent alignment and fast bolt-up
- Multiple customer reports of reliable, leak-free performance after installation
- Low weight and compact packaging make it easy to handle and ship
- No explicit manufacturer warranty information provided in the product details
- Long-term longevity beyond user reports is not independently verified
- Does not include thermostat or gaskets so additional parts may be required for a complete repair
Verdict A practical, direct-fit thermostat housing that reliably restores coolant routing on 3.6L Chrysler 300s for owners focused on dependable, no-fuss repairs.
2. WMPHE Aluminum Engine Coolant Thermostat Housing Assembly
| Temperature of start working | 95°C / 203°F |
|---|---|
| Material Type | Aluminum |
| Fitment | Chrysler 300 2011-2022 |
This aluminum thermostat housing assembly replaces the factory housing and thermostat to regulate coolant flow and keep the engine at its correct operating temperature. Designed as a direct replacement for the listed part numbers, it installs in place of the original unit and is typically used when a leaking or failed plastic housing needs replacement. The aluminum construction improves heat dissipation and resists wear and corrosion compared with molded plastic housings, which can reduce the chance of repeat failures. Fitment is intended for Chrysler 300, Dodge Challenger, and Dodge Charger model years shown, and many buyers report a straightforward bolt-on install with good sealing when gaskets and fasteners are correct. Some users do report occasional early thermostat failure or minor fit differences that require trimming or different fasteners, so expect basic mechanical skill and a small parts swap in a DIY job. For convenience-focused owners, this is a durable factory-replacement option that can keep the cooling system working without a shop visit in many cases.
Best for: Convenience-driven buyers who want a durable, factory-style replacement they can install themselves to avoid a repair shop visit and restore reliable cooling on Chrysler 300 vehicles.
Less Ideal for: People seeking a lifetime guaranteed or brand-new OEM part with manufacturer support should consider dealer-sourced replacements or parts with explicit long-term warranties.
- Aluminum construction offers better heat dissipation and improved resistance to wear and corrosion versus plastic housings
- Direct replacement for multiple factory part numbers for Chrysler 300 and related models
- Designed to restore proper coolant flow and engine temperature control to prevent overheating
- Many buyers report easy bolt-on installation without needing professional service
- A small number of reviews mention early thermostat failures where the valve stuck open
- Fit may require minor adjustments or alternative fasteners in some installations
Verdict A sturdier aluminum, bolt-on thermostat housing for Chrysler 300 owners who want a convenient, DIY replacement to restore proper cooling, with occasional fitment or early-thermostat risks to watch for.
3. Torquizo Aluminum Coolant Thermostat Housing Assembly
| Compatible engines | 3.6L V6 |
|---|---|
| Fitment years | 2011-2022 |
| Material | Aluminum alloy |
| Manufacturer | Torquizo |
| OEM part numbers | 902-3035HP, 5184977AD, 5184977AE, 5184977AG, 5184977AH, 902-3035, 824-203, 85943, 34776 |
This aluminum thermostat housing assembly replaces the factory plastic housing on 3.6L V6 Chrysler 300, Dodge Challenger, and Charger engines and is used to route coolant and mount the thermostat and temperature sensor. Made from aluminum alloy, the housing offers greater resistance to cracking and heat-related deformation compared with plastic originals, which is helpful for high-mileage or performance engines. It includes a bleeder/weep port and matches the listed OEM part numbers for direct replacement fitment, so installation is straightforward for someone swapping the factory unit. Some buyers reported small casting debris inside the part on arrival, so a quick rinse before installation is advised. A few reviews noted fitment or functionality issues, so careful verification of part numbers and inspection during install is recommended. For drivers tuning or pushing their cooling system harder, the metal construction is a clear benefit, but it does not change thermostat calibration or ECU control and is still a direct-fit replacement rather than an upgraded performance thermostat.
Best for: Performance-oriented owners focused on durability and thermal stability who want a metal, direct-replacement housing to reduce failure risk under aggressive driving.
Less Ideal for: Buyers seeking changed cooling behavior or a lower-cost short-term fix should consider alternatives; this is a direct-fit replacement and not a performance thermostat with different temperature ratings.
- Aluminum construction reduces risk of cracking and heat warp compared with plastic housings.
- Direct replacement for listed OEM part numbers for straightforward fit on specified 3.6L V6 models.
- Includes bleeder/weep port which aids in thorough cooling-system bleeding.
- Multiple buyer reports confirm fit and function on covered Chrysler/Dodge models.
- Some units arrived with small casting debris requiring cleaning before installation.
- Does not alter thermostat temperature calibration or improve thermostat control.
Verdict A durable aluminum direct-replacement thermostat housing for 3.6L V6 Chrysler/Dodge models that improves long-term reliability but does not change thermostat performance.
4. OCPTY Thermostat Housing Assembly for Chrysler 300 and Compatible Dodge Models
| Included Components | Thermostat |
|---|---|
| Material Type | Metal |
| Specific Uses For Product | vehicle temperature control, automobile cooling system management |
| Compatibility Note | Fits Chrysler 300 2005-2010 and certain Dodge models |
This OCPTY thermostat housing assembly replaces the factory housing and thermostat to restore correct coolant flow and engine temperature regulation on compatible Chrysler 300 and related Dodge models. It is supplied as a single compact unit intended for direct replacement and is used when a leaking or failed housing or thermostat causes overheating or poor warm-up performance. The listing highlights temperature sensing components and an intelligent control chip to keep engine temperature within the normal range, and the housing is described to resist heat and cold for longer service life. Installation is straightforward for a mechanically inclined DIYer since the part is built to fit like the factory piece. Limitations include the generic presentation of technical details and the lack of explicitly listed calibration or opening temperature; buyers should confirm exact fitment and thermostat spec for their engine before purchasing. For a budget repair or emergency replacement this unit offers a practical, low-cost way to get a cooling system back to working order.
Best for: Practical, budget-conscious owners who prioritize a low-cost, direct replacement to get a Chrysler 300 cooling system back in service without a premium aftermarket price.
Less Ideal for: Owners seeking an exact documented performance spec, upgraded performance thermostat, or track use cooling solutions should consider higher-end or performance-specific replacements instead.
- Designed as a direct-fit replacement to match factory mounting and routing
- Includes thermostat and housing in a single compact assembly for easier installation
- Advertised heat and cold resistance for extended service life
- Low-cost option suitable for budget repairs
- Manufacturer does not list the thermostat opening temperature or detailed specs
- Listing lacks detailed technical documentation that some repairers prefer
Verdict A cost-effective, direct-fit thermostat housing assembly that restores cooling function for Chrysler 300 owners who need an affordable replacement rather than a performance upgrade.
5. JXGZYD Engine Thermostat 203°F Replacement for Chrysler 300 and Related V8 Models
| Brand | JXGZYD |
|---|---|
| Model | JX-4 |
| Opening Temperature | 203°F |
| Manufacturer Part Number | 52028898AE |
This JXGZYD thermostat is a direct-replacement style unit designed to open at 203°F and restore normal coolant flow for affected Chrysler 300 V8 engines. It is used when a failed thermostat causes overheating, slow warm-up, or sets a P0128 code. The metal construction and factory-style form make it suitable for bolt-in installation under the thermostat housing, and many buyers report it fits and functions like the original when the correct gasket is used. Practical benefits include returning the engine to correct operating temperature quickly and resolving temperature-related drivability or emissions issues. Known limitations are variability in fit for some model years and a thinner supplied gasket, so reusing the vehicle's original gasket or confirming housing dimensions before installation is wise. The seller provides customer support and a stated one-year coverage for manufacturing defects, which helps risk-averse buyers seeking a predictable replacement.
Best for: Risk-averse mainstream buyers who prefer a straightforward, manufacturer-backed replacement to restore normal engine temperature and eliminate thermostat-related faults on their Chrysler 300 V8.
Less Ideal for: Shoppers seeking guaranteed fitment across every production year without verification or those who want an upgraded high-performance thermostat for modified engines.
- Factory-style metal construction intended to match original thermostat function
- Designed to open at 203°F, useful for restoring proper engine warm-up and coolant flow
- Reported by multiple customers to fit and fix temperature codes on Chrysler 300 V8 models
- Manufacturer offers 24-hour support and a one-year coverage for defects
- Some buyers reported fitment issues with certain model years and housing sizes
- Included gasket is thinner than OEM and may not seal reliably without using the old gasket
Verdict A cost-effective, factory-style 203°F replacement thermostat for Chrysler 300 V8s that generally restores proper temperature control but requires fit verification and often a better gasket.
6. Allmotorparts Thermostat Housing Replacement for Chrysler/Dodge/Jeep 5.7L–6.4L Hemi
| Brand | Allmotorparts |
|---|---|
| Manufacturer Part Number | AMP345 |
| Compatible Engines | 5.7L, 6.1L, 6.4L Hemi |
| Replaces Part Number | 902-689 |
This Allmotorparts thermostat housing is an aftermarket replacement intended to replace the factory thermostat housing on compatible Hemi engines. It installs where the engine meets the radiator and houses the thermostat valve, so its job is to seal coolant passages and maintain proper engine temperature control. Typical use is a like-for-like swap when the original housing is cracked, leaking, or the thermostat area is corroded. The part is described as OE-style fit and ready to install out of the box, which makes it a straightforward DIY repair for someone replacing a leaking housing and thermostat. Customer feedback indicates consistent fitment and durable performance on Chrysler and Dodge Hemi vehicles. One limitation is that this is not a genuine factory part so material finish and coating may differ from factory units; a few users reported bubbling of internal coating over long service. Also confirm exact vehicle year and engine before purchase since compatibility depends on Hemi variant and model year ranges.
Best for: Practical optimizers who want a low-cost, ready-to-install replacement to fix a leaking or failed thermostat housing and get their Chrysler back on the road without source hunting for an OEM unit.
Less Ideal for: Buyers seeking a factory genuine part for long-term peace of mind or those who require manufacturer-backed warranty support should consider dealer-sourced replacements instead.
- Direct replacement fit for many 5.7L, 6.1L and 6.4L Hemi Chrysler/Dodge/Jeep models
- Sold as a ready-to-install aftermarket unit for simple DIY replacement
- Multiple buyer reports of reliable sealing and good fitment on Chrysler and Dodge vehicles
- Aftermarket part rather than a factory genuine component so materials and coating may differ
- Some reports of internal coating bubbling after extended use
Verdict A budget-friendly aftermarket thermostat housing that delivers straightforward fitment for Hemi Chrysler/Dodge models, suitable for DIY repairs but not a factory genuine part.
7. BDFHYK Aluminium Coolant Thermostat Housing Assembly for Chrysler 300 and Dodge Challenger/Charger 3.6L
| Fitment | Chrysler 300 and Dodge Challenger/Charger 2011–2022, 3.6L V6 |
|---|---|
| Material | Upgrade Aluminium |
| Manufacturer Part Numbers | 902-3035HP, 5184977AD, 5184977AE, 824-203 |
This aluminum thermostat housing assembly replaces the factory plastic unit to control coolant flow and help the engine reach and maintain operating temperature. It is intended as a direct replacement for Chrysler 300 and Dodge Challenger/Charger 3.6L engines and comes with the gasket and mounting hardware used during installation. The aluminum construction improves durability and reduces the chance of cracking compared with plastic housings, which is helpful if you run a high-mileage vehicle or live in extreme temperatures. Reviews show straightforward installation for many owners, though a few reported fitment or missing small parts, so confirm OE numbers and check the kit contents before you start. The housing uses the same mounting locations and coolant passages as the factory part, so it functions the same in-service but with a longer-lived material. Expect to replace hoses or clamps when installing to ensure leak-free sealing and avoid reusing aged connectors.
Best for: A balanced all-round buyer who wants a durable, longer-lasting replacement for the factory plastic housing without paying dealership prices and values a practical, maintenance-focused upgrade.
Less Ideal for: Drivers who need a complete OEM-specified kit guaranteed to include every fastener out of the box or those unwilling to verify OE numbers and confirm fit before installation should consider other sources.
- Aluminum construction is stronger and less prone to cracking than stock plastic housings.
- Designed to fit Chrysler 300 and Dodge 3.6L V6 models from 2011–2022, matching factory mounting points.
- Ships with gasket and mounting hardware to simplify installation in most cases.
- Helps restore proper coolant flow and engine temperature control, improving reliability and preventing overheating.
- Some buyers reported missing small fasteners or washers in the package, so contents may vary.
- A minority of users experienced fitment or sealing issues that required adjustment or additional clamps.
- Thermostat unit gaskets supplied with the assembly may be lower quality and could need replacement for long-term leak prevention.
Verdict A cost-effective, more durable aluminum replacement for the factory plastic thermostat housing that suits owners wanting a practical, long-lasting upgrade for 3.6L Chrysler/Dodge V6 engines.
Choosing the Right Chrysler 300 Thermostat: Key Factors to Consider
Correct Fitment and Housing Compatibility
Ensuring the thermostat matches the Chrysler 300's specific housing dimensions and mounting pattern matters because improper fit can cause coolant leaks or poor sealing. A thermostat that sits flush in the housing ensures even coolant flow and prevents bypass that would otherwise delay engine warm-up. Fitment also affects installation time and whether existing seals or housings must be replaced. Choosing a part that lists explicit fitment information and includes or matches gasket specifications reduces the risk of post-installation leaks and ensures proper mechanical alignment with the vehicle's coolant passages.
Opening Temperature and Tolerance
The thermostat's rated opening temperature determines when the engine begins to circulate coolant through the radiator, directly influencing warm-up speed and operating temperature. A unit with the correct nominal temperature and tight manufacturing tolerance maintains consistent engine performance and emission characteristics. If the opening temperature is too low, the engine may run cooler than intended, causing reduced fuel efficiency and heater performance. If it opens too late or at the wrong range, overheating risk increases. Look for thermostats with clearly stated temperature ratings and minimal variance.
Material Quality and Valve Construction
Materials used in the thermostat frame, valve, and wax element affect longevity and resistance to corrosion from coolant and additives. Higher-quality metals and corrosion-resistant coatings can withstand repeated thermal cycling and reduce the chance of valve sticking or premature failure. Valve construction and the integrity of the wax pellet or thermal element determine reliable movement over many cycles. A robust build also helps the thermostat maintain its rated temperature response despite years of exposure to heat and coolant chemistry changes.
Seal Type and Resistance to Leaks
The seal between the thermostat and the housing is a common failure point, so the type and quality of included seals or gaskets are important. Materials that resist coolant additives, heat, and compression set will preserve a tight seal and reduce the odds of a thermostat housing seal leak. Consider whether the part includes a new gasket or O-ring sized for the Chrysler 300 housing. If not, you should plan to replace the seal when installing the thermostat to avoid weeping or localized coolant loss.
Ease of Installation and Serviceability
Thermostats that align with original mounting points and do not require special tools reduce installation time and the likelihood of installation errors. Ease of access to the thermostat housing on the Chrysler 300 can vary by model year, so parts that simplify the process are beneficial for DIYers and technicians alike. Serviceability also includes availability of replacement seals and the clarity of installation instructions. A design that allows quick removal and replacement without extensive disassembly can lower labor time and make future maintenance less disruptive.
Long-Term Reliability and Thermal Cycling Performance
A thermostat must withstand repeated heating and cooling cycles over many miles. Parts with proven resistance to sticking, warping, or loss of spring tension will maintain consistent engine temperature control longer. Consider products with materials and designs known to tolerate thermal cycling and coolant exposure. Reliable long-term performance reduces the chance of symptoms like overheating, engine running cold, or intermittent thermostat-related faults that can lead to more extensive repairs.
FAQ
What are common signs a Chrysler 300 thermostat is failing?
Common signs often include the engine overheating, an engine that takes too long to reach normal operating temperature, or temperature gauge fluctuations. You might also notice poor heater performance or unexplained coolant leaks near the thermostat housing. These symptoms usually indicate the thermostat is sticking, not opening at the correct temperature, or the housing seal is compromised.
How do you test a thermostat without removing it?
You can monitor the engine temperature and heater performance for signs of delayed warm-up or overheating, and watch the upper radiator hose for temperature change as the engine warms. Another method is to use an infrared thermometer to check the housing and hose temperatures to see if the thermostat opens at the specified range. These checks give useful clues but are less definitive than bench testing or inspection after removal.
Can a bad thermostat cause the engine to run cold or overheat?
Yes, a thermostat that sticks open will often cause the engine to run colder than normal because coolant circulates continuously, preventing proper warm-up. Conversely, a thermostat that sticks closed or opens too late can lead to overheating. Both conditions affect engine efficiency and cabin heating and may cause longer-term damage if not addressed.
Should I replace the thermostat when servicing a housing seal leak?
Often it is sensible to replace the thermostat and any related seals or gaskets when addressing a housing seal leak. Replacing both components together reduces the chance of repeat leaks and ensures the sealing surfaces and the thermostat interface are fresh. This approach minimizes the need for repeated disassembly and helps restore proper coolant system integrity.
How long do thermostats usually last in passenger vehicles?
Thermostat lifespan varies with material quality, coolant maintenance, and driving conditions, but they often last several years and tens of thousands of miles. Regular coolant changes and avoiding contaminated coolant can extend life. If you observe any of the signs of bad thermostat behavior, it is wise to inspect and replace the unit rather than wait for complete failure.
How We Chose the Best Chrysler 300 Thermostat
Our selections focus on parts and components that reliably restore proper cooling-system operation in the Chrysler 300. We prioritized correct fitment to the vehicle's cooling passages and housings, consistent opening temperature and tolerance, durable construction of the valve and gasket interface, and compatibility with the vehicle's coolant and operating pressures. We also considered ease of installation, availability of replacement seals and housings, and reports of long-term reliability under typical driving conditions. We excluded universal or generic thermostats that require significant modification or unverified fitment claims. Units that lacked clear temperature ratings or did not provide compatible gasket or housing specifications were also left out. The result is a shortlist of options that meet the practical needs of Chrysler 300 owners seeking reliable temperature regulation and straightforward installation.
Our full evaluation process is outlined in our review methodology.
Conclusion
Prioritize correct fitment, the right opening temperature, and durable seals when choosing a thermostat for a Chrysler 300. These factors most directly affect warm-up time, heater performance, and the risk of coolant leaks. Balance material quality and ease of installation against long-term reliability. Replacing seals or the housing during installation can prevent future leaks and reduce the chance of repeated service.
