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If your Kia Soul is running too cold, overheating, or taking too long to warm up, the thermostat is often the most practical place to start. Choosing the right Kia Soul thermostat matters because the correct part ensures accurate engine temperature, consistent heater performance, and reduced wear from thermal stress. This guide presents seven shortlisted thermostats chosen for their fitment reliability and construction quality. We evaluated each option based on fit accuracy, material durability, and sealing performance to help you pick a replacement that restores proper engine operation and cabin heating. Read on for the full list and what to look for when replacing the thermostat.
Looking for other parts? See all Kia Soul parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Dorman Engine Coolant Thermostat Housing (902-5920) |  |
| Most Popular A crowd favorite that many people choose with confidence | XCZBX Engine Thermostat with Gasket (180°F / 82°C) |  |
| Best Quality Built to a higher standard if you want something more solid | Baxzl Aluminum Engine Coolant Thermostat Housing Assembly |  |
| Best Budget The cheapest option that still gets the job done reliably | SCITOO Thermostat Housing Assembly (replacement 25500-2E000) |  |
| Most Sold A high-volume bestseller chosen again and again | ApplianPar Thermostat Assembly for Hyundai/Kia (Model 25500-23010) |  |
| Best Value for Money The sweet spot between price and what you get | X AUTOHAUX Thermostat Housing Assembly (25500-2E000) |  |
| Best Overall The best all-around choice for most situations | YOUYIEN Aluminum Engine Coolant Thermostat Housing Assembly Kit with Heater Pipe |  |
1. Dorman Engine Coolant Thermostat Housing (902-5920)
| Brand Name | Dorman |
|---|---|
| Included Components | 1 Thermostat Housing |
| Material Type | Metal |
| Item Type Name | Engine Coolant Thermostat Housing |
This Dorman thermostat housing replaces the factory thermostat housing on specified Hyundai/Kia model years and is intended to restore a leak-free coolant path. Typically installed when the original housing has cracked or corroded, it provides the same mounting points and connections so the thermostat and hoses install like the factory part. Notable features include durable metal construction and a polished finish that resists cracking from thermal cycling. In practice that means fewer coolant leaks and longer service life compared with corroded OEM housings, and many users report straightforward bolt-on installation. Limitations are that fitment is limited to the vehicle years listed by the manufacturer, so you must confirm compatibility with your trim, and the polished appearance may not match an unmodified engine bay if aesthetics matter. The part list and labeling also include model-specific information you should cross-check before ordering.
Best for: Reliability-focused buyers who prioritize a durable, factory-quality replacement part to stop coolant leaks and extend service intervals.
Less Ideal for: Buyers looking for a universal or multi-vehicle replacement or those who prefer aftermarket parts with different styling or performance features.
- Factory-style fit for specified Hyundai and Kia model years
- Durable metal construction designed to resist cracking from temperature changes
- Polished finish that resists corrosion and presents a clean engine-bay appearance
- Straightforward bolt-on installation matching factory mounting points
- Compatibility limited to the exact vehicle years and trims listed by the manufacturer
- Polished finish may not match a stock engine appearance for some owners
Verdict A durable, factory-fit thermostat housing that fixes leak-prone original units for buyers who want a reliable, long-lasting replacement.
2. XCZBX Engine Thermostat with Gasket (180°F / 82°C)
| Opening temperature | 180°F (82°C) |
|---|---|
| Manufacturer | XCZBX |
| Manufacturer part number | 25500-23010, 2550023010, 2550023001 |
This XCZBX thermostat is a direct-style replacement that controls coolant flow by opening at approximately 180°F (82°C) and comes with a matching gasket for installation. It is intended to restore normal operating temperature and prevent overheating or overcooling on compatible vehicles. The unit uses a stainless steel mounting flange and a stainless spring frame, which should give it better sealing and durability than basic aftermarket pieces. For a Kia Soul needing a 180°F thermostat, it installs in the housing where the upper radiator hose meets the engine and functions the same way as the factory component. Expect straightforward performance when fitment is correct, though some buyers report tight clearances that make access and installation fiddly on certain engines. Also verify the vehicle part number carefully before fitting because interchange listings can be inconsistent. If you need a simple, serviceable replacement that matches factory operating temperature, this unit covers that role effectively.
Best for: Convenience-driven buyers who want a straightforward, factory-spec replacement to restore normal cooling operation on a Kia Soul without hunting for OEM dealers.
Less Ideal for: Those seeking a performance thermostat with a different opening temperature or professional shops needing guaranteed fitment across multiple model years should consider alternatives.
- Factory-style 180°F (82°C) opening temperature matches common Kia thermostat spec
- Includes gasket for a one-piece replacement and better sealing
- Stainless steel mounting flange and spring frame for improved durability
- Designed to meet or exceed original equipment performance
- Some users report fitment problems despite vehicle compatibility listings
- Installation can be tight and may require significant disassembly on some engines
Verdict A practical, factory-style 180°F replacement thermostat for Kia Soul owners who want a convenient service repair, provided you confirm exact fitment before installation.
3. Baxzl Aluminum Engine Coolant Thermostat Housing Assembly
| Brand | Baxzl |
|---|---|
| Model | Engine Coolant Thermostat |
| Exterior | Machined |
| Manufacturer Part Number | JWQ-04K0-2G500L |
This machined aluminum thermostat housing assembly replaces a failed factory unit and restores coolant routing and thermostat mounting on compatible 2.4L engines. It is intended for direct replacement installation and is typically used when the existing housing is cracked, leaking, or the thermostat needs servicing. The housing is described as machined aluminum and inspected before shipment, which suggests better heat resistance and durability compared with lower-cost plastic housings. Practical benefits include a more robust metal construction that can handle engine heat cycles and an engineered fit aimed at matching factory function for a straightforward swap. Limitations to be aware of are that fitment is for specific 2.4L applications and you must confirm compatibility with the Kia Soul variant in question; the assembly may require transferring the original thermostat or sensors depending on the vehicle, and gasket or seal condition will affect leak-free installation. Expect a moderately simple replacement for a DIYer or shop familiar with coolant-system service.
Best for: Performance-oriented owners who prioritize a durable, metal replacement when repairing coolant components and want a robust upgrade over plastic housings.
Less Ideal for: Buyers who need a universal solution or who prefer a complete plug-and-play kit that includes thermostat, sensors, and seals should consider other options.
- Machined aluminum construction offers improved heat resistance over typical plastic housings
- Designed as a direct replacement to match factory function for compatible 2.4L engines
- Multiple inspections claimed to ensure product stability and reduce early defects
- Compatible with common replacement part numbers for easier sourcing
- Fitment limited to specific 2.4L engine applications so confirmation with the Soul is required
- May require reuse or transfer of original thermostat, sensors, and seals which are not guaranteed included
Verdict A machined aluminum, factory-style thermostat housing for buyers who want a durable, performance-minded replacement for compatible 2.4L Kia Soul engines.
4. SCITOO Thermostat Housing Assembly (replacement 25500-2E000)
| Replaces | 25500-2E000 |
|---|---|
| Fitment (listed) | Kia Soul 2012-2019 |
| Brand | SCITOO |
| Model | 179236 |
This SCITOO thermostat housing assembly replaces the factory housing and routes coolant through the thermostat area to regulate engine temperature. It is used when the original housing is cracked, leaking, or when a thermostat replacement requires a new housing for proper sealing. The part is advertised as a direct replacement to match factory fit and mounting points, which simplifies installation for a DIYer or a shop following factory procedures. The product listing highlights corrosion-resistant exterior treatment and claims high sealing to avoid coolant leaks. Practical benefits include low cost compared with dealer parts and a straightforward swap using existing thermostat and sensors. Limitations are that aftermarket housings can vary in casting tolerances and finish, so hose fitment and sensor sealing may require minor adjustment or new gaskets; longevity compared with OEM parts is not guaranteed. Buyers should verify the part number and fitment before purchase to ensure compatibility with their vehicle.
Best for: Budget-conscious owners who prioritize low repair cost and want a straightforward replacement part they can install themselves or have installed at a local shop.
Less Ideal for: Owners seeking a lifetime factory-quality replacement or those who prefer dealer-sourced parts and full OEM provenance should consider alternatives.
- Low-cost replacement alternative to dealer parts
- Sold as a direct-fit housing to match factory mounting points for easier installation
- Corrosion-resistant external finish intended to reduce surface degradation
- Compact, simple design that makes it suitable for straightforward repairs
- Aftermarket casting and tolerances may differ from factory parts which can affect hose or sensor fitment
- Durability and long-term reliability may not match OEM factory-quality components
Verdict A wallet-friendly, direct-fit thermostat housing for Kia Soul owners needing a quick replacement, though it may not match OEM longevity.
5. ApplianPar Thermostat Assembly for Hyundai/Kia (Model 25500-23010)
| Model | 25500-23010 |
|---|---|
| Replaces part numbers | 25500-23010, 25500-2G670, 25500-23001 |
| Compatible engines | Various 1.5L–2.4L Kia/Hyundai 4-cylinder applications |
This thermostat assembly is a direct-replacement style unit sold to swap into compatible 4-cylinder Hyundai and Kia cooling systems. It installs in the thermostat housing to regulate coolant flow and engine temperature, opening at the designed set point so the engine warms up properly and then circulates coolant when hot. The listing calls out compatibility with many Kia models and replaces several factory part numbers, which simplifies sourcing the right part. Buyers report straightforward installs and functioning thermostats when fitment matches, and the unit ships with basic gasket hardware in some cases. Common limitations are fitment variability and occasional incorrect gaskets, so double-check the housing design and gasket match before final installation. One reviewer experienced a loose fit in a specific housing design requiring replacement housing work, so this part may not suit every subvariant despite the broad model list. For routine thermostat swaps on compatible Kia engines this delivers the expected function, but confirm housing type and gasket fit to avoid leaks or extra work.
Best for: Risk-averse mainstream buyers who prioritize a straightforward replacement part and want a commonly stocked thermostat that matches factory part numbers for routine maintenance on their Kia.
Less Ideal for: Owners who cannot verify their thermostat housing variant or who need guaranteed factory-original parts for exact-fit performance should consider sourcing a confirmed factory-quality unit instead.
- Marketed as a direct replacement for multiple factory part numbers to simplify finding the right unit.
- Works as a standard thermostat to control engine warm-up and coolant circulation when fitment is correct.
- Multiple user reports of successful installs and working thermostats on compatible vehicles.
- Gasket included with some units may be incorrect for certain housings requiring a separate gasket.
- Fitment can vary between subvariants leading to loose fit or sealing issues in some cases.
- Does not include detailed vehicle-specific housing fit verification, requiring buyers to confirm compatibility before installation.
Verdict A budget-friendly direct-replacement thermostat that works well when the housing and gasket match, but verify fitment carefully to avoid leaks.
6. X AUTOHAUX Thermostat Housing Assembly (25500-2E000)
| OE Number | 25500-2E000 |
|---|---|
| Condition | Brand New |
| Material | Plastic, Metal |
| Position | Inside |
This X AUTOHAUX thermostat housing assembly replaces a failed housing and the thermostat that controls coolant flow to the radiator. Designed as a direct-fit aftermarket part for vehicles using part number 25500-2E000, it installs in place of the factory unit and lets the engine reach and maintain proper operating temperature by opening and closing the coolant passage as coolant heats. Typical use is a DIY or shop replacement when the original housing leaks, cracks, or the thermostat sticks. The unit pairs plastic and metal construction and ships as a single assembly so you do not need to source seals separately. Practical benefits are straightforward: it restores coolant control, stops leaks at the housing, and is inexpensive compared with dealer parts. Limitations are that it is a non-factory replacement with a lighter-duty spring reported by some users and plastic components that may not match long-term durability of a factory part, so it is best for cost-conscious repairs rather than performance upgrades.
Best for: Practical optimizers looking to fix a coolant-housing leak or a sticking thermostat on a budget and willing to accept a non-factory replacement to save money.
Less Ideal for: Buyers seeking a long-term OEM-equivalent solution or those who prioritize maximum durability and heavy-duty components for high-mileage or performance vehicles.
- Direct-fit replacement for part number 25500-2E000 simplifying installation
- Ships as a complete thermostat housing assembly so no additional parts are required
- Low-cost option that restores proper coolant regulation and stops housing leaks
- Combination of plastic and metal keeps unit lightweight while maintaining basic durability
- Aftermarket construction may use a lighter-duty spring and plastics that could wear faster than factory-quality parts
- Not a factory part so long-term durability can vary between vehicles
Verdict A budget-friendly, direct-fit thermostat housing assembly that gets your Kia Soul's cooling system working again but uses aftermarket materials that may not match factory longevity.
7. YOUYIEN Aluminum Engine Coolant Thermostat Housing Assembly Kit with Heater Pipe
| Brand | YOUYIEN |
|---|---|
| Manufacturer Part Number | ECTHTBHH2PYYCC |
| Fitment | Chevy Cruze/Sonic/Trax 1.8L (listed models) |
| Package Contents | Thermostat housing, heater pipe, sensor gasket |
This aluminum thermostat housing assembly kit replaces the factory water outlet on compatible 1.8L engines and comes with a throttle body inlet heater pipe and sensor gasket for a single installation. It is typically used when the original plastic housing has cracked or started leaking; the all-aluminum construction is intended to resist warping and withstand higher temperatures better than plastic. Buyers report straightforward bolt-on fitment when the mating surfaces are cleaned and old gasket material removed. The kit’s main practical benefit is improved durability compared with brittle plastic housings and inclusion of the heater pipe and gasket reduces parts hunting. Some users noted casting or connector fit issues that required minor filing or resulted in an unusable retaining clip, and one review reported a thermostat that did not operate properly, so careful inspection at install is advisable. This is a sensible factory-replacement style option if you want a longer-lasting housing, but expect to verify fit and trim small casting interference in a few cases.
Best for: Balanced all-round buyers looking for a durable, factory-style replacement housing that reduces future failures and minimizes parts sourcing during a thermostat or coolant outlet repair.
Less Ideal for: Buyers who need a guaranteed perfect fit without any on-car trimming or those seeking an aftermarket performance thermostat with altered temperature rating should look elsewhere.
- Aluminum construction reduces risk of cracking and warping compared with plastic housings.
- Includes throttle body inlet heater pipe and sensor gasket so you get the main replacement parts in one kit.
- Multiple reviewers report good fit and leak-free installation when surfaces are properly prepped.
- Appears to meet factory-style fitment for the listed 1.8L applications, simplifying replacement.
- Some units show minor casting interference requiring light filing to fit sensor retaining clip.
- At least one report of a connector/profile that would not accept the retaining clip, leading to return.
- One reviewer reported a thermostat that did not open or close, indicating occasional quality control issues.
Verdict A tougher aluminum replacement housing kit that bundles the heater pipe and gasket for an easier repair, but inspect the casting and connectors during installation for occasional fit or quality issues.
Choosing the Right Kia Soul Thermostat: Key Factors to Consider
Correct Opening Temperature
The thermostat s primary function is to open at a specific temperature to circulate coolant. Selecting a unit with the correct opening temperature for your Kia Soul ensures the engine reaches operating temperature reliably without running too cold or overheating.
A thermostat that opens too early can cause long warm-up times and reduced heater output, while one that opens too late risks elevated engine temperatures and added stress. Look for parts that specify the opening temperature and a tight tolerance range to maintain consistent engine performance under varied driving conditions.
Fitment and Mounting Compatibility
Accurate fitment and correct mounting geometry are essential to prevent leaks and ensure the thermostat engages properly with the cooling passages. A mismatch can lead to poor sealing, coolant loss, or improper valve movement.
Confirm the housing interface, bolt pattern, and overall dimensions match your Kia Soul. Parts that include clear fitment data reduce installation complications and minimize the chance of return or rework during replacement.
Sealing Design and Gasket Quality
A reliable thermostat housing seal is critical to prevent coolant leaks that can produce overheating or loss of coolant. Pay attention to whether the part includes an integrated gasket, an O-ring, or a separate seal and what material is used.
Durable gasket materials and proper compression design minimize the risk of leaks over time and exposure to varying coolant chemistries. If the replacement requires reusing an old gasket, consider replacing the seal concurrently to avoid future failures.
Material Durability and Corrosion Resistance
Thermostats and their housings operate in a harsh environment of heat, pressure, and corrosive coolant additives. Materials that resist corrosion and fatigue prolong service life and reduce the chance of warping or failure.
Metal components should be corrosion-resistant or coated, and any plastic housings should be rated for high-temperature resistance. Choosing parts built from robust materials reduces the frequency of repeat replacements and helps maintain consistent engine cooling performance.
Valve Responsiveness and Spring Quality
The mechanical valve must respond predictably to temperature changes, which depends on the internal wax pellet, spring tension, and overall assembly quality. Smooth, repeatable opening and closing prevent temperature oscillations and help stabilize engine operation.
Inspect specifications or manufacturer information on spring design and actuation reliability where available. A well-constructed valve assembly is less likely to stick open or closed, which would otherwise cause engine running cold thermostat stuck open conditions or overheating.
Ease of Installation and Serviceability
A thermostat that is straightforward to install reduces labor time and the chance of installation errors that cause leaks or improper operation. Consider whether the part includes necessary seals and whether the design allows access without extensive disassembly.
Serviceability also means availability of clear instructions and replacement components. A design that is easy to service makes future maintenance faster and helps ensure the replacement performs as intended after installation.
FAQ
What are common signs of a bad Kia Soul thermostat?
Common signs include erratic temperature gauge readings, the engine taking too long to reach normal operating temperature, or persistent overheating. You may also notice reduced cabin heating or coolant leaks around the thermostat housing. These symptoms often indicate the thermostat is stuck open, stuck closed, or the housing gasket is failing.
How can I test a Kia Soul thermostat without removing it?
You can monitor temperature behavior during a controlled drive and watch the temperature rise and stabilize as the engine warms. Also check heater output once warm. For a more direct check, some technicians use infrared thermometers to read temperatures at the thermostat housing and downstream radiator hose to infer valve operation. These methods often indicate an issue but do not replace a physical inspection when symptoms persist.
What causes a thermostat housing seal leak on a Kia Soul?
Seal leaks commonly result from degraded gaskets, improper torque on housing bolts, or surface irregularities on the mating surfaces. Thermal cycling and exposure to coolant additives over time can harden or crack seals, leading to slow leaks. Ensuring correct seal material and proper installation torque helps reduce this risk.
Is it safe to drive a Kia Soul with a thermostat stuck open?
Driving with a thermostat stuck open usually results in the engine running cooler than intended, which can reduce heater performance and increase engine wear over time. While it may not cause an immediate catastrophic failure, continued use can affect fuel efficiency and emissions. It is generally advisable to address the issue promptly.
How do I confirm the correct thermostat part number fitment for my Kia Soul?
Verify your vehicle year, engine code, and OEM part number references when selecting a replacement. Cross-reference these details with the supplier s fitment information and any compatibility guides provided. Accurate fitment data helps avoid installation issues and ensures the thermostat functions as intended.
How We Chose the Best Kia Soul Thermostat
We prioritized parts that match Kia Soul factory fitment and maintain accurate opening temperature to prevent engine overheating or chronic underheating. Key criteria included thermostat opening temperature tolerance, material and corrosion resistance, and the quality of the thermostat housing seal or gasket. We also considered valve responsiveness and build robustness to withstand repeated thermal cycles, plus compatibility with common vehicle coolant types. Units lacking clear fitment data, poor sealing designs, or marginal material specifications were excluded. Our selection filters favored items with precise fitment details, durable construction, reliable sealing solutions, and straightforward mechanical design suitable for routine replacement.
Our full evaluation process is outlined in our review methodology.
Conclusion
Prioritize a thermostat that matches the specified opening temperature and fits the Kia Soul housing precisely. Good sealing design and durable materials reduce the risk of leaks and repeat failures. Consider valve responsiveness and ease of installation as secondary priorities to minimize downtime and ensure reliable engine temperature control. Balancing these factors will help you restore normal warm-up behavior and prevent overheating or persistent cold running. When in doubt, choose the option with clear fitment information and robust sealing details to avoid common replacement pitfalls.
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