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Picking the right Jeep Gladiator thermostat matters because the cooling system affects engine performance, warm-up time, and long-term durability. A properly fitting thermostat helps the engine reach and hold operating temperature, reducing wear and improving fuel efficiency while preventing overheating. This guide covers the seven shortlisted thermostats chosen for Gladiator owners, with a focus on fitment, material quality, and how each option supports reliable temperature regulation. Read on to see the evaluation criteria we used and what to look for when selecting the correct thermostat for your vehicle.
Looking for other parts? See all Jeep Gladiator parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Stant Superstat Premium Thermostat (180°F) |  |
| Most Popular A crowd favorite that many people choose with confidence | Dorman Engine Coolant Thermostat Housing Assembly (902-852) |  |
| Best Quality Built to a higher standard if you want something more solid | Mishimoto Racing Thermostat MMTS-WRA-87L for Jeep Wrangler (1987–2006) |  |
| Best Budget The cheapest option that still gets the job done reliably | Gates 33008S Premium Engine Coolant Thermostat |  |
| Most Sold A high-volume bestseller chosen again and again | EVIL ENERGY Thermostat Housing Assembly with Gasket and Thermostat |  |
| Best Value for Money The sweet spot between price and what you get | MITZONE Aluminum Thermostat Housing Assembly with Thermostat and Gasket |  |
| Best Overall The best all-around choice for most situations | A-Premium Thermostat Housing Assembly with Sensors and Two Thermostats |  |
1. Stant Superstat Premium Thermostat (180°F)
| Brand | MotoRad |
|---|---|
| Model | Superstat ® Premium Thermostat |
| Position | Front, Rear |
| Voltage | 230 Volts |
The Stant Superstat is a heavy-duty replacement thermostat that increases coolant flow and holds a precise opening temperature for reliable engine temperature control. It is typically used as a direct replacement in older V8 and inline engines where improved cooling under load matters, and the stainless-steel flange and larger piston support higher flow compared with standard units. Notable features include a larger diameter piston for stronger opening force, a machined stainless flange for corrosion resistance, and a balanced high-venturi design aimed at even opening. In real-world use this translates to cooler running under sustained high-load or hot-climate driving and steady thermostat operation that helps prevent hotspots. Limitations are that you must pick the correct temperature rating for your engine application and it is a mechanical thermostat so it will not offer variable electronic control; installation requires basic cooling-system work and occasional bleeding for trapped air. For owners seeking a durable, consistent mechanical thermostat, the Superstat is a practical upgrade.
Best for: A reliability-focused buyer who prioritizes proven, durable factory-quality replacements and wants a thermostat that keeps temperatures steady during heavy use and hot-weather driving.
Less Ideal for: Drivers seeking electronic or variable-temperature thermostats or those who prefer factory-programmed cooling controls should look at other solutions.
- Higher flow design improves coolant circulation under heavy load.
- Stainless steel flange resists corrosion and adds durability.
- Larger piston provides stronger, more consistent opening at its set temperature.
- Balanced venturi design promotes even opening to avoid uneven cooling.
- Available only as a mechanical thermostat so no electronic modulation.
- Must choose the correct temperature rating for the vehicle or engine application.
Verdict A robust, high-flow mechanical thermostat for drivers who want consistent, durable temperature control under heavy or hot-duty conditions.
2. Dorman Engine Coolant Thermostat Housing Assembly (902-852)
| Manufacturer | Dorman Products |
|---|---|
| Model | 902-852 |
| Compatible Vehicles | Select Jeep Gladiator and other specified Jeep/Dodge model years (confirm fitment) |
| Exterior | Ready To Paint If Needed |
This Dorman thermostat housing assembly replaces the factory water outlet and houses the thermostat for compatible Jeep Gladiator model years listed by the manufacturer. It is used when the stock housing cracks, leaks, or the thermostat fails and is designed for a direct-fit swap to restore correct coolant flow and engine operating temperature. Notable features include a preinstalled gasket, durable construction engineered to resist cracking from extreme temperature changes, and aftermarket engineering aimed at matching OEM fit. In practice the unit simplifies a routine cooling-system repair: remove the old housing, fit the replacement, refill and burp the system. Benefits are straightforward for do-it-yourselfers and independent shops — easy installation, reduced downtime, and a low-cost way to clear operating-temperature codes or improve cabin heat. Limitations include the usual risk with aftermarket parts of occasional fitment or functional variance on certain model years, so verify vehicle fitment before buying and be prepared to follow proper coolant refill and bleeding procedures to avoid air pockets.
Best for: Convenience-minded owners who prioritize a straightforward, low-effort repair to restore normal operating temperature and clear temperature-related engine codes on their Jeep Gladiator.
Less Ideal for: Owners who prefer factory-brand parts or who want dealer-level warranty and support should consider a factory replacement instead.
- Direct replacement design intended to match factory fit and function
- Durable construction engineered to resist cracking from temperature cycling
- Preinstalled gasket speeds installation and helps reduce leak risk
- Aftermarket engineering targets common failure points to restore correct operating temperature
- Possible fitment or functional variance on some model years requiring extra verification
- Requires proper coolant refill and system burping after installation to avoid air pockets
Verdict A practical, low-cost direct-fit replacement to restore coolant thermostat function on compatible Jeep Gladiator models, but confirm fitment and follow proper refill procedures.
3. Mishimoto Racing Thermostat MMTS-WRA-87L for Jeep Wrangler (1987–2006)
| Fitment | Jeep Wrangler 1987–2006 (2.5L/4.0L/4.2L) |
|---|---|
| Activation temp | 180°F (82°C) |
| Material | Aluminum |
| Included components | Thermostat seal |
This Mishimoto racing thermostat reduces operating temperature by opening at a lower set point (180°F) than a factory thermostat, letting coolant circulate sooner to keep engine temps down under heavy loads. It installs in place of a stock unit and is commonly used when towing, off‑road crawling, or running in very hot climates to reduce overheating and engine wear. The unit is aluminum construction and comes with a high‑quality seal; Mishimoto engineers these parts for direct fitment to older Jeep cooling housings. The practical benefit is a measurable drop in dash needle temperature and fewer heat‑related issues during stop‑and‑go or uphill driving. Limitations: lowering thermostat temperature can increase warm‑up time and may slightly reduce HVAC heater output on cold days, and a small number of users reported premature failures so fitting with a new gasket and checking installation is advised.
Best for: Performance‑oriented buyers who prioritize lower operating temperatures and improved engine longevity during towing, off‑road, or heavy‑load use on their Gladiator.
Less Ideal for: Drivers who value quickest possible cabin heat or those with a completely stock cooling system who do not push the engine thermally may prefer a factory‑spec thermostat.
- Opens at 180°F for lower steady‑state engine temperatures compared with factory thermostats
- Aluminum construction for improved heat transfer and durability
- Sold with a high‑quality thermostat seal for a direct replacement fit
- Engineered for performance cooling so it pairs well with upgraded radiators and fans
- Lower opening temperature increases engine warm‑up time and can reduce cabin heat initially
- Not guaranteed to eliminate overheating if other cooling components are worn or undersized
Verdict Choose this Mishimoto racing thermostat if you want lower steady‑state temps and better protection under heavy use, but expect longer warm‑up times and check overall cooling system condition.
4. Gates 33008S Premium Engine Coolant Thermostat
| Manufacturer Part Number | 33008S |
|---|---|
| OEM Part Number | 3333594 |
| Included Components | Engine Coolant Thermostat |
| Material | Plastic |
This Gates 33008S thermostat is a simple replacement part that opens and closes to control coolant flow, helping the engine reach and hold its normal operating temperature. Installed in the cooling housing, it is used during routine maintenance or when an overheating or slow warm-up issue appears. The listing highlights an all-stainless-steel construction with a larger heat motor and spring intended to improve response and durability compared with basic units. In practice that means more consistent temperature control, quicker warm-up and potentially slightly better fuel economy and emissions when the engine is at proper temp. Several users report reliable long-term operation, though there are a few notes about fitment and temperature labeling on individual pieces, so verify the correct spec for your Gladiator before installing. This is a no-frills, budget-friendly option that aims to perform like a factory-quality replacement without extra features beyond solid mechanical design.
Best for: Budget-conscious owners wanting a reliable, factory-replacement style thermostat for routine cooling-system maintenance on a Jeep Gladiator who prioritize cost and dependable temperature control.
Less Ideal for: If you need a performance thermostat with a nonstandard opening temperature, adjustable settings, or an OEM-specific calibrated unit, consider higher-spec or vehicle-specific options instead.
- Stainless-steel construction for corrosion resistance and durability
- Larger heat motor and spring for more responsive temperature control
- Helps faster engine warm-up which can improve fuel economy and reduce emissions
- Widely used as a direct replacement in many legacy applications, indicating broad compatibility
- Some units have reported incorrect temperature stamp or fitment variations requiring verification before installation
- Manufacturer listing shows discontinued status which may affect long-term availability
Verdict A cost-minded, mechanically solid replacement thermostat that delivers reliable temperature control for routine repairs on a Jeep Gladiator, but double-check fitment and temperature markings before installing.
5. EVIL ENERGY Thermostat Housing Assembly with Gasket and Thermostat
| Specific Uses For Product | 2011-2015 Dodge Durango 6 Cyl 3.6L, 2011-2020 Jeep Grand Cherokee 6 Cyl 3.6L, 2012-2017 Jeep Wrangler 6 Cyl 3.6L |
|---|---|
| Operating temperature | Thermostat opening temperature: 203°F |
| Included Components | Thermostats, Rubber Gasket, Plastic Housing, Nitrile gloves |
| Material | Plastic |
| Mounting Type | In-Vehicle/Engine Bay Mount |
This thermostat housing assembly is a direct-replacement style kit that combines the plastic housing, thermostat, and gasket to restore proper cooling system operation on 3.6L Gladiator engines. It is typically used when the factory thermostat or housing leaks or the thermostat sticks and causes cooling or temperature-sensor fault codes. The package includes the thermostat, rubber gasket, and nitrile gloves so you can swap the unit without sourcing extra parts. The housing is plastic and designed to mount in the engine bay like the factory component, with the thermostat opening set to about 203°F to control coolant flow to the radiator. In practice this kit offers an affordable, all-in-one repair that many owners can install at home and avoid dealer labor. Be aware some users report quality variation and occasional out-of-box failures where the thermostat did not open properly, so double-check operation during initial warm-up and be prepared to return a defective part if needed.
Best for: Risk-averse mainstream buyers who prioritize restoring reliable cooling function without expensive dealer service and prefer buying a ready-to-install repair kit for their Gladiator.
Less Ideal for: Drivers who want heavy-duty or longer-lived metal housings or who prefer OEM-branded parts from the factory parts department should consider other options.
- Complete kit includes thermostat, housing, gasket and gloves for a one-purchase repair
- Thermostat calibrated to open around 203°F which matches common engine thermostats
- Plastic housing designed for direct in-vehicle engine bay mounting like a factory replacement
- Many buyers report straightforward fit and easy DIY installation that saves shop labor
- Plastic construction may not match the longevity of metal aftermarket alternatives
- Some customer reports of defective units arriving stuck open requiring replacement
Verdict An affordable, ready-to-install thermostat housing kit that can get a Gladiator back to proper operating temperature quickly, but quality can vary so check operation after installation.
6. MITZONE Aluminum Thermostat Housing Assembly with Thermostat and Gasket
| Compatible models | Jeep Gladiator (fitment limited to listed Jeep models) |
|---|---|
| Thermostat opening | 203 Deg. F / 95 °C |
| OEM part numbers replaced | 5184651AF, 5184651AG, 5184651AH, 902-852 |
| Includes | Thermostat, housing, gasket, screw |
This kit replaces the factory plastic coolant outlet with a cast-aluminum housing, a thermostat rated to open around 203 F (95 C), and a gasket plus a mounting screw for straightforward installation on compatible Jeep engines. It is typically used when the stock housing cracks or the thermostat fails and you want a longer-lasting, metal alternative; installers report plug-and-play fitment and that mounting points align with the factory location. The aluminum housing offers better heat resistance and stiffness than plastic, reducing the chance of future cracks or warping under heat cycling, and the included thermostat and gasket let you complete the repair in one stop. Some users note slight differences in discharge tube angle that flexible hoses accommodate, and a small number of reviews report thermostat operation issues, so verifying part numbers and testing after install is prudent. For DIYers and shops wanting a budget-friendly, more durable replacement, this kit covers the basics without extra performance features.
Best for: Practical optimizers who want a cost-conscious, longer-lasting replacement for a factory plastic thermostat housing and prefer a single-kit fix to restore normal cooling performance.
Less Ideal for: Buyers seeking a performance thermostat or a precision-engineered racing unit should look at dedicated performance parts instead.
- Cast aluminum housing improves durability compared with plastic housings
- Includes thermostat and gasket so you can replace the entire assembly in one job
- Reported plug-and-play fitment for Jeep installations with factory mounting alignment
- Maintains expected opening temperature around 190–203 F for normal engine operation
- Not a direct performance thermostat upgrade—no adjustable or high-flow design included
- A few reports of thermostat sticking or inconsistent opening behavior in isolated cases
Verdict A budget-friendly, durable aluminum replacement that bundles the housing, thermostat, and gasket for a practical one-stop repair on compatible Jeep cooling systems.
7. A-Premium Thermostat Housing Assembly with Sensors and Two Thermostats
| Thermostat opening temperature | 203 Deg. F |
|---|---|
| Outlet Port Quantity | 5 |
| Mounting Hole Quantity | 3 |
| Thermostat Included | 2x Thermostat |
| Material | Plastic |
This thermostat housing assembly combines the housing, two thermostats and seals into one replacement kit so you can swap the entire cooling outlet in one job. It installs in place of the factory housing and is typically used when the original housing cracks, leaks, or the thermostat sticks. Notable features include two thermostats (one preinstalled), two O‑rings, five outlet ports and three mounting holes, which simplifies installation and provides the usually required fittings for the cooling hoses. The plastic housing keeps weight and cost down and the included thermostats open at about 203°F, matching common operating points for these engines. Several users report it fits and seals well when bolts are started in the correct order, while others found minor alignment issues that required patience to seat the unit. If you need a complete, budget-friendly replacement that bundles parts needed for the job, this is convenient; if you expect an exact factory plug‑and‑play fit every time, be prepared to trial-fit and adjust during installation.
Best for: Balanced, practical buyers who want a single replacement kit to restore cooling system function without sourcing multiple parts and who prioritize convenience and value.
Less Ideal for: Drivers seeking an exact factory-metal replacement for long-term durability or professional shops that require guaranteed bolt‑perfect fitment every time should consider alternatives.
- Complete kit includes housing, two thermostats and two O‑rings so you do not need to source parts separately
- Thermostats rated to open at 203°F which matches common engine thermostat specs
- Multiple outlet ports and factory-style mounting pattern cover the typical hose connections
- Plastic construction reduces corrosion and is easier to handle during install
- Plastic housing may not match metal factory parts for longevity in high-heat or high-stress conditions
- Some units require careful bolt sequencing or minor alignment during installation to seat properly
Verdict A convenient, value-focused complete thermostat housing kit that restores cooling function but may need careful fitting during installation.
Choosing the Right Jeep Gladiator Thermostat: Key Factors to Consider
Correct Vehicle Fitment
Thermostat fitment determines whether the part seals correctly and aligns with the housing and coolant passages. A thermostat that is not specified for the Jeep Gladiator can cause leaks, poor sealing, or binding during installation.
Fitment also affects the ease of installation. Correctly matched parts reduce the risk of disturbing adjacent sensors or hoses and help keep the cooling system sealed and functioning as designed.
Opening Temperature and Tolerance
The thermostat's rated opening temperature controls when coolant starts circulating through the radiator and therefore influences warm-up speed and operating temperature stability. A thermostat that opens too early can leave the engine running cold, while one that opens too late can increase overheating risk.
You should consider the tolerance range around the rated temperature because tight tolerances offer more predictable control under varying loads and ambient conditions.
Material Quality and Corrosion Resistance
Thermostat housings and internal components are exposed to coolant and varying temperatures, so material choice impacts durability. Corrosion-resistant metals and quality plating on housings and springs help prevent premature failure or sticking.
Consider components that resist electrochemical degradation and are compatible with typical coolant formulations to reduce the chance of seizing or leaks over time.
Seal and Housing Interface Design
A proper seal between the thermostat and housing prevents coolant leaks and maintains system pressure. Look for designs that provide even seating and a reliable gasket or o-ring interface to reduce the need for re-torquing or repeated repairs.
A well-designed interface also simplifies installation by minimizing the chance of misalignment that can damage the seal or surrounding coolant passages.
Valve Mechanism and Responsiveness
The internal valve and spring determine how quickly the thermostat reacts to temperature changes. Responsive mechanisms open and close smoothly, improving temperature regulation during varying driving conditions and reducing thermal shock.
Durable valve components and consistent movement help avoid sticking at partial openings, which can cause erratic temperature readings and reduced cooling performance.
Documentation and Part Number Clarity
Clear documentation and unambiguous part numbers simplify finding the correct replacement for the Jeep Gladiator and help ensure compatibility with the vehicle's cooling system. Accurate labeling reduces the risk of ordering the wrong item and supports a smoother installation.
Good instructions and torque specs also reduce the chance of installation errors that could lead to leaks or sensor issues.
FAQ
What are common signs of a bad thermostat in a Jeep Gladiator?
Common signs often include the engine overheating, the temperature gauge rising suddenly, or the engine taking too long to reach normal operating temperature. You may also notice heater performance changes or inconsistent temperature readings. These symptoms usually indicate a thermostat that is stuck open or closed, but other cooling system faults can cause similar behavior.
How can I test a thermostat without removing it?
You can monitor engine temperature behavior during warm-up and under load to look for anomalies. A diagnostic scan tool that reads coolant temperature sensor data can show whether the thermostat is allowing flow at the expected temperature. For a definitive test, however, removing the thermostat and checking its opening in hot water at its rated temperature is the most direct method.
Will a thermostat housing seal leak cause overheating?
A leaking housing seal can allow coolant loss or air entry into the cooling system, which may reduce cooling efficiency and lead to higher engine temperatures. Small leaks sometimes present as localized coolant residue, while larger leaks can cause visible coolant loss and temperature rise. Addressing sealing issues promptly helps maintain proper cooling system pressure and performance.
Is it normal for an engine to run cold if the thermostat is stuck open?
Yes, if a thermostat is stuck open it can allow continuous coolant circulation, preventing the engine from reaching its designed operating temperature. That can reduce heater output and lead to increased engine wear and poorer fuel economy. The issue is typically identified by persistent low temperature readings even after extended driving.
How important is using the correct thermostat part number fitment?
Using the correct part number is important because it ensures the thermostat matches the Gladiator's housing, sensor locations, and thermal characteristics. Correct fitment reduces the risk of leaks, simplifies installation, and preserves expected temperature control. Mismatched parts may appear to fit but can cause sealing or sensor alignment problems.
What should I expect during a thermostat replacement process?
Replacement generally involves draining enough coolant to access the housing, removing the housing cover, swapping the thermostat and gasket, and refilling and bleeding the cooling system. Expect to follow torque specs for the housing bolts and to check for leaks after the engine reaches operating temperature. The exact steps can vary based on access and engine layout.
How We Chose the Best Jeep Gladiator Thermostat
We focused on practical fitment and thermal performance when building this list for the Jeep Gladiator. The primary filters were exact vehicle fitment and compatibility with factory cooling systems, followed by thermostat opening temperature tolerance and consistency under load. Build materials and corrosion resistance were reviewed to assess long-term durability, as was seal and housing interface design to reduce leak risk. We also evaluated valve and spring quality to estimate responsiveness during cold starts and heavy cooling demands, plus documentation and part number clarity to simplify installation. Exclusions included units without clear Gladiator fitment information, generic or universal thermostats lacking proper sealing design, and parts with unverified material claims. The result is a set of options that balance correct fit, dependable temperature control, and durable construction.
Our full evaluation process is outlined in our review methodology.
Conclusion
When choosing a replacement for a Jeep Gladiator thermostat, prioritize correct vehicle fitment and a rated opening temperature that matches the engine's design. Durable materials, a reliable seal interface, and a responsive valve mechanism reduce the chance of leaks, sticking, or poor temperature control. Balancing these factors helps you maintain consistent engine temperature, reduce wear, and keep the cooling system functioning properly. Use clear part numbers and documentation to ensure a smooth replacement and fewer surprises during installation.
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