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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.
Looking for other parts? See all Chrysler 300 parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Dorman Engine Coolant Thermostat Housing Assembly (902-3035) |  |
| Best Quality Built to a higher standard if you want something more solid | Mopar Thermostat with Housing (5184570AK) |  |
| Best Value The sweet spot between price and what you get | BOXI Thermostat Housing Kit Assembly for Chrysler 300 / Dodge Challenger / Charger 3.6L V6 (2011–2018) |  |
| Best Budget The cheapest option that still gets the job done reliably | BDFHYK Thermostat Housing Assembly for Chrysler/Dodge 3.6L V6 (902-3035) |  |
| Highest Rated A top-rated pick with lots of positive feedback | Dorman 902-3036 Engine Coolant Thermostat Housing Assembly |  |
| Most Popular A crowd favorite that many people choose with confidence | Dorman 902-3035HP Thermostat Housing Assembly with Thermostat (Aluminum, Chrysler/Dodge) |  |
| Best Seller A high-volume bestseller chosen again and again | JXGZYD Engine Thermostat 203°F Replacement for Chrysler 300 and Related V8 Models |  |
1. Dorman Engine Coolant Thermostat Housing Assembly (902-3035)
| Included Components | 1 Thermostat Housing, 1 Thermostat, 1 Gasket |
|---|---|
| Material Type | Metal |
| Model Number | 902-3035 |
| Vehicle Fitment Years | 2011–2021 (Chrysler 300, Dodge Challenger, Dodge Charger) |
This Dorman thermostat housing assembly combines the thermostat, gasket, and housing into a single replacement unit intended for Chrysler 300, Dodge Challenger, and Dodge Charger V6 engines from 2011–2021. It installs in place of the original water outlet and is designed to resist cracking and leaking from repeated temperature cycling. Included components simplify repair by eliminating the need to source a separate gasket or thermostat, and many users report straightforward installation and a secure fit that clears related check engine lights. The metal construction aims to offer longer service life than some plastic housings, and Dorman promotes this as a cost-effective aftermarket alternative to dealer parts. Some buyers have reported long-term reliability issues on occasion, so expect to monitor coolant temperature and codes after installation. This part is best when you want a near-factory replacement at lower cost and a one-piece solution that reduces parts-sourcing and installation time.
Best for: Balanced all-round buyers who want a reliable, cost-effective factory-style replacement that simplifies repair and minimizes parts sourcing effort.
Less Ideal for: Drivers seeking an upgraded performance thermostat or those who prefer OEM dealer parts and warranty support should consider other options.
- Complete assembly includes housing, thermostat, and gasket for a single-step replacement
- Metal construction designed to withstand extreme temperature changes and resist cracking
- Fits specific Chrysler 300/Dodge Charger/Dodge Challenger V6 model years 2011–2021 to simplify part selection
- Many users report easy installation and a secure, factory-like fit
- Some customers report thermostat failures or temperature-control codes after extended use
Verdict: A one-piece, metal thermostat housing assembly that delivers near-factory fit and an all-in-one replacement for Chrysler 300 and compatible Dodge V6 models.
2. Mopar Thermostat with Housing (5184570AK)
| Specific Uses For Product | 3.6L V6 – Flex, 3.6L V6 – Gas |
|---|---|
| Included Components | Thermostat, housing, seal, and bleeder screw |
| Material Type | Metal |
| Model Number | 5184570AK |
This Mopar thermostat with housing is a factory-quality replacement intended for 3.6L V6 Chrysler applications and ships with the thermostat, housing, seal, and bleeder screw for a direct swap. It replaces a worn or failing thermostat to restore proper engine warm-up, eliminate temperature-related fault codes, and maintain the cooling system at the correct operating range. As a genuine Mopar part it matches factory fit and valve calibration, so installation typically results in predictable temperature control and improved long-term reliability compared with many aftermarket units. Buyers should expect a straightforward installation when they have the right tools, though access and bleeding the cooling system can add labor time. The unit is metal construction and arrives as a complete assembly, which reduces parts matching and seals the potential leak points. It does not include performance-tuned temperature calibration options, so enthusiasts seeking an altered warm-up profile should look elsewhere.
Best for: Performance-oriented owners who prioritize factory-grade reliability and predictable engine temperature control for Chrysler 300s with the 3.6L V6.
Less Ideal for: Drivers seeking an adjustable or high-performance thermostat with a nonstandard opening temperature should consider performance-specific alternatives.
- Factory-quality part and calibration matched to Chrysler 3.6L V6 engines
- Includes housing, seal, and bleeder screw for a complete, leak-reducing assembly
- Metal construction for durable, long-lasting service
- Restores correct engine warm-up and can clear temperature-related fault codes
- No adjustable or performance-tuned opening temperature for custom cooling needs
- Installation may require moderate mechanic time to access and properly bleed the cooling system
Verdict: Choose this Mopar thermostat housing when you want a factory-matched replacement that restores reliable temperature control for a 3.6L V6 Chrysler 300.
3. BOXI Thermostat Housing Kit Assembly for Chrysler 300 / Dodge Challenger / Charger 3.6L V6 (2011–2018)
| Fitment | 2011-2018 Chrysler 300 / Dodge Challenger / Charger 3.6L V6 |
|---|---|
| Includes | Thermostat, housing, gasket |
| Manufacturer | ShangHai BOXI Auto Parts Co., Ltd. |
| Manufacturer Part Number | BX00500032-1 |
This BOXI thermostat housing kit replaces the factory housing, thermostat, and gasket in 3.6L V6 Chrysler 300, Dodge Challenger, and Dodge Charger models from 2011 through 2018. It is supplied as a preassembled unit so installations are straightforward and typical use is a one-time replacement to resolve cooling system faults, temperature irregularities, or check-engine codes tied to the thermostat. Notable features include included thermostat and gasket, claimed factory-quality testing, and matching OE part numbers for fitment. In practice this kit simplifies the job for home mechanics and shops because it arrives assembled and drops into the stock location without additional machining or modifications. The material feels like aftermarket plastic compared with a dealer part, so longevity may vary with driving conditions, but multiple owner reports show successful fits and reliable operation when installed correctly. The kit offers a budget-friendly alternative to dealer parts with the convenience of a ready-to-install assembly while requiring the usual care during installation to avoid leaks or incorrect sensor connections.
Best for: Practical optimizers who want a low-cost, ready-to-install replacement that restores normal cooling function without paying dealer prices.
Less Ideal for: Owners seeking an exact dealer-sourced part or who prefer metal-bodied housings for extreme-duty applications should consider alternative factory replacement options.
- Complete kit includes thermostat, housing, and gasket for a single-source replacement
- Preassembled design reduces install time and fitment errors
- Matches common OEM part numbers for direct compatibility with specified 3.6L V6 models
- Budget-friendly option compared with dealer parts while claiming factory-quality testing
- Housing appears to be aftermarket plastic which may not match dealer part durability in all climates or high-heat use
Verdict: A cost-effective, ready-to-install thermostat housing kit that restores cooling function on 3.6L V6 Chrysler 300 and related models without the premium cost of dealer parts.
4. BDFHYK Thermostat Housing Assembly for Chrysler/Dodge 3.6L V6 (902-3035)
| Fitment | Chrysler 300 / Dodge Challenger / Charger 2011-2022 3.6L V6 |
|---|---|
| Manufacturer | BDFHYK |
| Model | 902-3035(Plastic) |
| Manufacturer Part Number | BD-05-10417BK |
This thermostat housing assembly replaces the factory unit on 3.6L V6 Chrysler 300 and Dodge Challenger/Charger models from 2011 through 2022. It mounts in place of the original housing and houses the thermostat that opens and closes to regulate coolant flow between the engine and radiator, restoring correct operating temperature. The part is offered in a durable plastic construction and lists multiple equivalent OEM part numbers for straightforward fit confirmation. Buyers report easy installation when fitment matches and that the included gasket and hardware simplify the swap, which makes it a practical do-it-yourself repair to stop overheating or poor warm-up. Some users have found defective units or fitment issues and recommend verifying the OE number and checking for complete hardware before installation. Expect to add clamps or sealant in a few cases and to source missing small washers separately if they are not provided. For budget repairs this offers a low-cost route back to reliable cooling when the match is correct.
Best for: Budget-conscious owners who want an affordable, do-it-yourself replacement to restore correct engine temperature on a Chrysler 300 or Dodge Challenger/Charger 3.6L V6 without paying dealer prices.
Less Ideal for: Those seeking a long-term heavy-duty upgrade or buyers unwilling to verify OE numbers and confirm included hardware should consider higher-end aluminum replacements or professional-sourced parts.
- Direct-fit design for Chrysler 300 and Dodge Challenger/Charger 3.6L V6 models when correct OE number is used
- Durable, heat-resistant plastic construction intended to meet factory replacement standards
- Includes gasket and hardware in many listings to simplify installation
- Low-cost option compared with dealer parts, making repairs affordable for budget-conscious owners
- Some buyers reported fitment problems or leaking units out of the box
- Occasional missing small parts such as washers requiring an extra trip to source replacements
Verdict: An economical, direct-replacement thermostat housing for 3.6L V6 Chrysler 300 and Dodge Challenger/Charger owners who need a budget-friendly fix to restore proper engine cooling.
5. Dorman 902-3036 Engine Coolant Thermostat Housing Assembly
| Material | Aluminum; Rubber |
|---|---|
| Position | Center |
| Manufacturer | Dorman Products |
This Dorman thermostat housing assembly replaces the factory water outlet on compatible Chrysler-family models and integrates the thermostat and housing in a single unit for a straightforward swap. Intended for reliability-focused repairs, it is made from aluminum with a rubber gasket and is designed to resist cracking and leaking under extreme temperature changes. Typical use is a coolant-system repair or thermostat failure replacement during routine maintenance; installation requires draining coolant and refilling while properly bleeding air from the system. Notable features include a factory-style fit, a supplied gasket, and construction aimed at durability. Practical benefits are lower cost than dealer parts and high availability for common Chrysler-era V6 applications, making it a sensible option for DIYers and shops wanting a reliable replacement. Limitations include occasional fitment tightness in compact engine bays that can make bolt access awkward and isolated reports of early defects, so inspect the part and gasket before installation and confirm vehicle compatibility by trim and engine code.
Best for: Reliability-focused owners who prioritize a durable, factory-quality replacement and want a cost-effective part that restores proper cooling system function without dealer service.
Less Ideal for: Shoppers seeking a plug-and-play solution for multiple vehicle makes should avoid this if you need universal fitment or if you prefer factory dealer-sourced parts with extended dealer support.
- Factory-style fit and gasket included for straightforward replacement
- Aluminum construction formulated to resist cracking from thermal cycling
- Designed as a complete housing assembly so thermostat and outlet are replaced together
- Widely used on Chrysler, Dodge, Jeep and Ram V6 vehicles so fitment is well-documented
- Tight bolt access on some engines can make installation time longer
- A small number of buyers reported individual units with casting cracks or leaks
Verdict: A durable, factory-style thermostat housing assembly that restores cooling system reliability for compatible Chrysler-family V6 vehicles.
6. Dorman 902-3035HP Thermostat Housing Assembly with Thermostat (Aluminum, Chrysler/Dodge)
| Manufacturer | Dorman Products |
|---|---|
| Model | 902-3035HP |
| Exterior | Ready To Paint If Needed |
| OEM Part Number | 5184977AD; 5184977AE; 5184977AG; 5184977AH |
This Dorman thermostat housing assembly replaces the original plastic water outlet with an aluminum unit and includes a thermostat for a one-piece replacement. It is typically used when the factory plastic housing has cracked or the engine is not reaching operating temperature, and the aluminum construction is intended to resist heat and brittleness that cause failures. The listing highlights patent-pending flow improvements aimed at better heat transfer and coolant circulation, and many owners report straightforward bolt-in fit and resolved P0128 codes after installation. Practical benefits include increased durability over plastic housings and fewer future coolant leaks from the outlet. Important limitations: a few users reported thermostat component failures or fitment differences in non-US variants, so verify fit for your exact trim and inspect the supplied thermostat elements during installation. For most DIYers the part simplifies replacement by combining the outlet and thermostat into one assembly, but keep a spare gasket and follow the burping procedure when refilling the system.
Best for: Buyers who prioritize convenience and a low-effort repair solution that reduces chances of repeat coolant outlet failures and speeds up installation.
Less Ideal for: Drivers who prefer sourcing individual OEM thermostat components or who need exact-market OEM orientation should consider getting a factory thermostat separately or verifying dealer parts instead.
- Aluminum construction reduces risk of cracking and heat-related failure compared with original plastic housings
- Includes thermostat and housing in one assembly for simplified replacement
- Patent-pending internal passages designed to improve coolant flow and heat transfer
- Application-specific design intended to match factory fit and function for listed Chrysler/Dodge models
- Some users reported thermostat component or seal failures requiring replacement of the thermostat element
- Fitment orientation may differ for certain market variants so double-check trim-specific notes before installation
Verdict: A durable aluminum, direct-replacement thermostat housing assembly that simplifies repair and upgrades the fragile factory plastic outlet.
7. 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.
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.
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.
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.
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.
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