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A properly functioning thermostat is vital for your Chevrolet Colorado V6 to reach operating temperature quickly and maintain stable engine temps under load. The right replacement thermostat improves heater performance, reduces cold-engine wear, and helps prevent overheating during towing or heavy use. This guide covers six shortlisted thermostats selected for fitment, durability, and consistent valve operation specifically for the Colorado V6.Below you will find evaluation notes on build quality, fitment considerations, and ease of installation to help you pick the best option for how you drive and maintain your truck.
Looking for other parts? See all Chevrolet Colorado parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Marketplace Auto Parts Thermostat Housing with Thermostat for 2017–2022 Chevy Colorado 3.6L V6 |  |
| Best Quality Built to a higher standard if you want something more solid | FUSCH Aluminum Engine Coolant Thermostat Housing Assembly |  |
| Best Value The sweet spot between price and what you get | NewYall Engine Coolant Thermostat with Housing Assembly (Model 12647l80) |  |
| Best Budget The cheapest option that still gets the job done reliably | MITZONE Aluminum Engine Coolant Thermostat Housing Assembly with Thermostat and Gasket |  |
| Highest Rated A top-rated pick with lots of positive feedback | ACDelco 12678784 Engine Coolant Thermostat and Housing Assembly |  |
| Most Popular A crowd favorite that many people choose with confidence | C-Tzu Aluminum Thermostat Housing Assembly with Thermostat (90°C) |  |
1. Marketplace Auto Parts Thermostat Housing with Thermostat for 2017–2022 Chevy Colorado 3.6L V6
| Compatible engines | 3.6L V6 LGZ (Vin N) |
|---|---|
| Model years | 2017–2022 Chevy Colorado |
| Thermostat opening temperature | 195F |
| Includes | Thermostat and housing assembly |
This thermostat housing assembly combines the housing and a 195F thermostat in one unit for direct replacement on 2017–2022 Chevy Colorado 3.6L V6 LGZ (VIN N) trucks. It installs where the factory housing sits and regulates engine coolant temperature by opening at the rated 195 degrees Fahrenheit. Buyers typically use it during routine cooling system repairs or when the original housing leaks or the thermostat sticks. The integrated design reduces parts handling and can speed up installation compared with replacing housing and thermostat separately. It is a straightforward factory-replacement style part intended for bolt-in fitment on the specified Colorado V6 variants. Limitations are that fitment is limited to the listed VIN and engine code and you should verify the vehicle application before buying; performance depends on correct installation and a properly bled cooling system.
Best for: Buyers who want a simple, all-in-one replacement part for routine cooling-system repair on a 2017–2022 Chevy Colorado 3.6L V6 and value ease of installation and correct fitment.
Less Ideal for: Do not choose this if your Colorado has a different engine code, VIN suffix, or if you prefer to source a thermostat and housing separately for custom cooling setups.
- Includes thermostat and housing for a single-step replacement
- Specifically matched to 2017–2022 Chevy Colorado 3.6L V6 LGZ (VIN N) fitment
- Rated 195F thermostat suitable for the engine's operating range
- Bolts in as a unit to simplify installation and reduce parts mismatch
- Compatibility limited to the specified engine code and VIN designation so not universal
Verdict: A convenient one-piece replacement that delivers correct fitment and a 195F thermostat for 2017–2022 Chevy Colorado 3.6L V6 trucks, ideal for buyers seeking a straightforward repair option.
2. FUSCH Aluminum Engine Coolant Thermostat Housing Assembly
| Fitment | Camaro/Colorado/Canyon/CT5/CT6/CTS/ATS V6 model years listed |
|---|---|
| Material | Aluminum |
| Seal material | NBR rubber |
| Included | Housing with thermostat assembly |
This aluminum thermostat housing assembly integrates the thermostat and a thick NBR rubber seal to control coolant flow and keep the engine at operating temperature. It is sold as a direct replacement for several 3.6L and 3.0L V6 applications and is made from corrosion- and heat-resistant aluminum, which helps it withstand underhood conditions better than many plastic housings. The heavier seal is intended to improve leak resistance and durability. Installation is straightforward for a competent DIYer since the part is built to fit factory mounting points and does not require special tools. Practical benefits include improved longevity compared with lower-cost plastic housings and a factory-style fit that simplifies coolant system service. One limitation is that this is an aftermarket single-piece housing and thermostat assembly, so if you only need a separate thermostat or a different temperature calibration, this unit may be more than required.
Best for: Buyers who want a durable, factory-style replacement that reduces the chance of housing failure and prefer a straightforward swap during a coolant system repair.
Less Ideal for: Shoppers who only need a standalone thermostat or want a custom temperature-calibrated performance thermostat should look for separate or performance-specific units.
- Aluminum construction offers better heat and corrosion resistance than typical plastic housings.
- Thicker NBR seal designed for improved leak resistance and oil and heat resistance.
- Manufactured to fit factory mounting points for straightforward, direct replacement installation.
- Combines housing and thermostat in one unit to simplify replacement during coolant service.
- Includes both housing and thermostat together so you cannot replace only one component if only the thermostat or housing is faulty.
Verdict: Choose this aluminum housing assembly when you want a rugged, factory-fit replacement that minimizes leak risk and simplifies coolant system repairs on the listed V6 models.
3. NewYall Engine Coolant Thermostat with Housing Assembly (Model 12647l80)
| Brand | NewYall |
|---|---|
| Model | 12647l80 |
| Manufacturer Part Number | 12647l80 |
| Compatible Engines | 3.0L and 3.6L V6 (listed GM models) |
This NewYall thermostat and housing assembly replaces the factory unit on select GM 3.6L V6 vehicles and is sold as a single integrated piece to simplify coolant system service. It installs in place of the OEM housing and houses the thermostat to control engine coolant flow and operating temperature. Buyers will appreciate the unit's all-in-one design which eliminates the need to transfer the old housing or chase down separate parts during a repair. Typical use is a direct replacement during routine thermostat failure or when servicing cooling leaks; the part is intended for bolt-in installation using existing mounting points and hoses. The practical benefit is reduced installation steps and a cleaner, updated housing surface compared with reusing a worn original. Limitations include the usual caution with aftermarket fit and finish variability and the need to verify model-year compatibility before ordering, as this assembly targets a specific set of Cadillac, Chevrolet, and GMC V6 engines rather than universal fitment.
Best for: Buyers who want a straightforward, practical replacement that minimizes shop time and parts juggling when fixing a failed thermostat on a Colorado 3.6L V6.
Less Ideal for: Do not choose this if you need a multi-vehicle universal part or if you plan to reuse a perfectly good original housing as it replaces that component entirely.
- Integrated thermostat and housing reduces parts to source during replacement
- Sold as a direct-fit assembly for specified GM 3.0L/3.6L V6 applications
- Simplifies installation by avoiding transfer of old housing components
- Replacement housing provides a refreshed mounting surface that can reduce future leakage risk
- Aftermarket fit and finish can vary so careful fitment check is recommended
Verdict: A practical, direct-replacement thermostat and housing assembly that cuts install time for Colorado 3.6L V6 owners needing a clean, ready-to-fit coolant thermostat solution.
4. MITZONE Aluminum Engine Coolant Thermostat Housing Assembly with Thermostat and Gasket
| Thermostat opening temp | 212 °F |
|---|---|
| Exterior | Aluminum |
| Includes | Housing, thermostat, gasket |
| Position | Inside |
This MITZONE thermostat housing assembly combines an aluminum housing, a preinstalled thermostat and a gasket into a single replacement unit intended to restore proper coolant flow and temperature control. It is used as a direct replacement when the factory housing leaks, cracks, or the thermostat fails; installation requires basic hand tools and attention to gasket seating. The aluminum construction should resist corrosion better than plastic housings and the included thermostat opens at 212°F, which matches common factory operating points for many GM V6 engines. Because the kit bundles the housing, thermostat, and gasket, it simplifies a one-stop repair and reduces the chance of missing parts during installation. Limitations are that the part comes without printed instructions and fitment must be confirmed for specific model years before purchase, and aluminum can transfer heat differently than the original material so care during installation is important to avoid overtightening.
Best for: Buyers looking for an affordable, all-in-one replacement thermostat housing kit to fix leaks or a failed thermostat on compatible GM V6 vehicles and who prefer a straightforward parts swap.
Less Ideal for: Drivers who need professional installation guidance included or who require a housing made from the original factory material for an exact OEM feel should consider other options.
- Includes housing, thermostat, and gasket for a complete one-piece replacement
- Aluminum construction offers improved durability and corrosion resistance over common plastic housings
- Thermostat set to open at 212°F which aligns with typical engine temperature control
- Compact kit simplifies repair and reduces need to source separate parts
- No printed installation instructions included
- Fitment must be verified for exact model years before ordering
Verdict: A budget-friendly, complete aluminum thermostat housing kit that replaces a failing unit and includes the thermostat and gasket for an easy, single-purchase repair.
5. ACDelco 12678784 Engine Coolant Thermostat and Housing Assembly
| Included Components | Engine Coolant Thermostat, Thermostat Gasket, Housing Gasket |
|---|---|
| Material Type | Alloy Steel |
| Model Number | 12678784 |
| Mounting Type | Engine Block Mount |
This ACDelco thermostat and housing assembly replaces a leaking or failed thermostat housing on compatible GM V6 engines and restores proper temperature control to the cooling system. It ships with the thermostat and gasket components needed for a direct replacement and is manufactured to GM factory specifications for fit and function. In everyday use it maintains correct operating temperature, helping the engine warm up predictably and preventing overheating under load. The alloy-steel housing and polished finish suggest corrosion resistance and durability compared with cheap aftermarket castings. Because it is a factory-style part, installation is straightforward for DIYers with basic hand tools and common cooling-system procedures. Limitations are minimal but include the need to match the exact OEM part number for fitment and following proper coolant bleeding and torque steps during install; it does not include hoses or additional hardware beyond the listed gaskets. For Colorado V6 owners prioritizing a long-term, factory-quality repair this part offers a direct, reliable replacement option.
Best for: Buyers who need a dependable, factory-quality replacement to restore proper cooling on a Chevrolet Colorado V6 and prefer a parts-first, longevity-focused repair approach.
Less Ideal for: Those looking for a universal aftermarket housing, a budget throwaway repair, or a kit that includes hoses and additional cooling components should consider other options.
- Factory-style design built to GM specifications for reliable fit and function
- Includes thermostat and gaskets for a single, complete housing replacement
- Alloy steel construction and polished finish improve corrosion resistance and durability
- Requires correct OEM part number matching for guaranteed fitment and does not fit multiple variants without verification
Verdict: Choose this ACDelco thermostat housing when you want a direct, factory-quality replacement that restores reliable cooling to a Chevrolet Colorado V6.
6. C-Tzu Aluminum Thermostat Housing Assembly with Thermostat (90°C)
| Thermostat opening temp | 194°F / 90°C |
|---|---|
| Material | Aluminum |
| Included parts | Thermostat and housing assembly |
| Manufacturer part number | 12647180 |
This C-Tzu housing assembly replaces the factory thermostat housing and includes a 194°F (90°C) thermostat for direct replacement on compatible 3.6L and 3.0L V6 GM applications. Made from aluminum, the unit is stiffer and more corrosion resistant than typical plastic housings, which helps prevent the common cracking and coolant leaks that occur over time. Installation is straightforward for a mechanically inclined DIYer and uses existing mounting points and coolant hoses, so it functions like a factory part while improving long-term durability. The integrated thermostat and leak-proof mating surfaces simplify the swap and reduce the number of parts to source. Limitations include the need to confirm exact year and engine fitment before buying and the fact that aluminum can transfer more heat to adjacent components than plastic, which may matter in custom engine bays. The product also replaces specific OEM numbers rather than covering all GM V6 variants, so correct application lookup is essential.
Best for: Buyers who prioritize a durable, longer-lasting replacement that addresses leaking or cracked factory housings and who rely on other owners' positive experiences as part of their decision process.
Less Ideal for: If you want a universal part covering many engines or prefer a stock-plastic aesthetic for exact factory appearance, look for a different factory-style housing option.
- Aluminum construction increases durability and resistance to cracking compared with plastic housings.
- Includes a 194°F (90°C) thermostat, so no separate thermostat purchase is required.
- Leak-proof mating surfaces designed to address common coolant leak points.
- Direct-replacement design uses existing mounting points for simpler installation.
- Fitment is limited to specific 2016–2022 GM V6 applications so you must verify compatibility before purchase.
- Aluminum housing may be less forgiving to overtightening compared with plastic, requiring cautious installation.
Verdict: Choose this aluminum replacement housing if you want a direct-fit, leak-resistant upgrade that outlasts plastic housings on compatible GM V6 vehicles.
Choosing the Right Chevrolet Colorado V6 Thermostat: Key Factors to Consider
Temperature Rating and Valve Setpoint
The thermostat's rated opening temperature determines when coolant begins circulating through the radiator, which affects warmup time and engine friction. For the Colorado V6, choose a thermostat with the correct setpoint to match engine design; a lower-than-intended setpoint can lead to running cold and higher fuel consumption, while a higher-than-intended setpoint can increase risk of overheating under load.
Valve design also matters. A poor-quality valve can stick closed or open late after repeated thermal cycles, producing thermostat symptoms overheating or inconsistent temperature readings. Reliable valve action preserves engine longevity and ensures the heater warms quickly for cabin comfort.
Material and Construction Quality
Thermostats operate in a corrosive, high-temperature environment. Brass, stainless components, or nickel plating can resist corrosion better than untreated metals and extend service life. The housing or flange must resist warping to maintain a good seal and prevent coolant leaks.
Inferior materials are more prone to scale buildup and may affect the valve mechanism. Durable construction also reduces the chance of thermostat housing seal leak and the need for repeated replacements.
Fitment and Included Hardware
Precise fitment to the Colorado V6 coolant passages and correct bolt patterns is essential to avoid installation headaches. Some aftermarket thermostats include gaskets, O-rings, or installation screws; others assume reuse of factory parts. Missing or incorrect hardware increases the chance of leaks and additional labor.
Verify that the part aligns with the vehicle thermostat part number fitment information where possible, and check whether a new gasket or seal is included to reduce the chance of a thermostat housing seal leak during installation.
Thermal Cycling Reliability
Thermostats are repeatedly exposed to heating and cooling cycles. Components that fatigue prematurely will stick open or closed, resulting in engine running cold thermostat stuck open conditions or overheating failures. Look for thermostats tested for many thermal cycles and with positive user reports of longevity.
Reliable thermal cycling performance reduces roadside failures and avoids the instability in coolant temperatures that can affect emissions and drivability.
Installation Complexity and Serviceability
Some thermostat replacements are straightforward, while others require partial disassembly of intake or coolant lines. Consider the time, tools, and any special sealant required for a successful replacement. A unit that includes an easy-to-seat gasket or O-ring will shorten installation time and lower the chance of installing a warped housing or creating a thermostat housing seal leak.
Also consider whether the thermostat can be serviced or requires full replacement if a minor issue occurs. Simpler designs tend to be easier to diagnose with basic tools when performing how to test a thermostat checks.
Compatibility With Cooling System Use Cases
How you use your Colorado V6 matters. Frequent towing, highway miles, or stop-and-go city driving place different stresses on the cooling system and may influence whether you prioritize faster warmup or enhanced high-temperature protection.
Choose a thermostat whose performance characteristics match your typical loads and climate to minimize thermostat replacement cost over time and avoid recurrent thermostat symptoms overheating or running cold under the vehicle's normal duty cycle.
Common Thermostat Symptoms and What They Mean
Understanding typical failure signs helps you decide whether the thermostat is the likely culprit before replacing it. Overheating during warm conditions, inconsistent temperature gauge readings, or an engine that takes a long time to reach normal temperature all point to thermostat issues.
Specific symptoms include the temperature gauge climbing rapidly once warmed, the heater producing little warm air, or an engine that idles poorly until it reaches operating temperature. These can also overlap with other cooling system problems, so use symptom patterns to prioritize inspection of the thermostat, housing seal, and coolant flow.
- Engine runs cold or takes too long to warm up: may indicate a stuck-open thermostat
- Temperature spikes under load: could be a thermostat sticking closed or opening late
- Coolant leaks at the thermostat housing: suggests a gasket or seal issue
- Fluctuating gauge: intermittent valve sticking or air pockets in the cooling system
How to Test a Thermostat on a Colorado V6
Basic diagnosis can separate thermostat faults from other cooling system problems. Start with a cold engine: feel the upper radiator hose while an assistant runs the engine. The hose should stay cool until the thermostat opens, then warm as coolant begins circulating. If the hose warms immediately, the thermostat may be stuck open.
For a more controlled check, remove the thermostat and inspect the valve and gasket. Heating the thermostat in hot water while monitoring the valve action confirms whether it opens at the rated temperature. Always follow safety practices for hot coolant and confirm correct part orientation when reinstalling to avoid leaks and incorrect operation.
- Monitor hose temperature change during warm-up to detect early flow
- Remove and bench-test the thermostat in hot water to observe valve opening
- Inspect housing surface and gasket for signs of a thermostat housing seal leak
Preventing Thermostat Housing Seal Leaks
A common cause of coolant leaks after replacement is a damaged or improperly seated gasket. Clean the mating surfaces thoroughly, remove old sealant, and inspect the thermostat housing flange for flatness. Use the correct gasket type or O-ring recommended for the Colorado V6 to ensure a tight seal.
Avoid over-torquing fasteners which can warp the housing or crush the gasket. If the housing shows signs of corrosion or warping, replace or service it before installing a new thermostat to prevent repeat leaks.
- Always clean mating surfaces and replace gaskets or O-rings when available
- Hand-start bolts and tighten to specified torque to avoid warping
- Check for housing corrosion and replace if the sealing surface is compromised
When To Replace the Thermostat Versus Other Cooling Components
Thermostat replacement is often the first step when facing temperature regulation problems, but other components can present similar symptoms. A failing water pump, clogged radiator, or collapsed coolant hose can produce overheating or poor warmup. Inspect these items when symptoms persist after thermostat inspection.
If you notice coolant contamination, extensive corrosion, or scale inside cooling passages, address those system-wide issues rather than repeatedly replacing thermostats. A comprehensive cooling system diagnosis will prevent unnecessary thermostat replacement cost and improve long-term reliability.
- Inspect water pump, radiator, and hoses as part of diagnosis
- Flush and refill coolant if contamination or scale is present
- Replace thermostat when valve failure or sealing faults are confirmed
Installation Tips to Minimize Problems
Before installing, compare the new thermostat's orientation and flange to the old one. Use a new gasket or O-ring and the correct sealant if specified. Tighten fasteners in a crisscross pattern to the recommended torque to avoid uneven sealing.
Bleed air from the cooling system after installation to prevent hot spots and fluctuating temperature readings. Verify proper heater operation and observe the upper radiator hose during the first warm-up to confirm the thermostat opens at the correct time.
- Confirm correct thermostat orientation and seating before tightening
- Replace gaskets and seals rather than reusing old hardware
- Bleed the cooling system to remove trapped air and check for leaks
Still looking for the perfect fit?
Select your Chevrolet Colorado configuration to see the most relevant Thermostats recommendations
How We Chose the Best Chevrolet Colorado V6 Thermostat
We evaluated thermostats for the Chevrolet Colorado V6 using vehicle-focused technical and practical criteria to narrow the field to dependable options. Key evaluation dimensions included: material and construction quality, such as corrosion-resistant alloys and robust housings that resist warping; thermostat valve design and temperature rating to ensure the valve opens at the correct setpoint for the V6 engine; fitment accuracy and included hardware to minimize installation issues and seal leaks on the Colorado-specific housing; thermal cycling reliability to resist sticking or failure after repeated heat-up and cool-down cycles; and ease of installation including gasket or O-ring quality and compatibility with factory coolant passages.We excluded items that lacked clear fitment data for the Colorado V6, had ambiguous temperature ratings, or used substandard sealing components. We also deprioritized thermostats with poor feedback on long-term reliability or those that required significant modification to the stock housing. The final shortlist favors products that match Chevrolet specifications, provide consistent valve action, and include the necessary seals or guidance to avoid thermostat housing seal leak problems.
Our full evaluation process is outlined in our review methodology.
FAQ
How long does a thermostat typically last in a Colorado V6?
Thermostat lifespan varies, but many last several years under normal use. Thermal cycling, corrosion, and coolant condition affect longevity, so inspect the part during major coolant service intervals.
Can a bad thermostat cause overheating only when towing?
Yes. Increased load from towing raises engine heat, and a thermostat that opens late or sticks can be more likely to create overheating under sustained heavy loads.
Will replacing the thermostat fix a cold-running engine?
If the thermostat is stuck open it will allow constant coolant flow and cause the engine to run cold. Replacing a stuck-open thermostat usually restores normal warmup, but verify with tests to rule out other causes.
Do I need to replace the gasket when I change the thermostat?
Often yes. Replacing the gasket or O-ring reduces the chance of thermostat housing seal leak. Some thermostats include new seals; if not, source the correct gasket for the Colorado V6.
How do I know the thermostat is opening at the correct temperature?
You can observe the upper radiator hose warming pattern during engine warm-up or bench-test the thermostat in hot water to confirm valve opening at the rated temperature. Use a thermometer if precise verification is needed.
Is it safe to drive with a thermostat that occasionally sticks?
Occasional sticking can lead to erratic temperature control and increases the risk of overheating. It is safer to address intermittent thermostat issues promptly to prevent engine damage.
Final Verdict
Prioritize thermostats that match the Chevrolet Colorado V6 temperature rating and offer solid construction with reliable valve action. Proper fitment and quality sealing components will reduce the risk of thermostat housing seal leak and repeat labor.Balance your priorities between fast warmup and high-temperature protection based on towing and driving patterns. By focusing on correct fit, tested thermal cycling performance, and included installation hardware, you can choose a thermostat that provides dependable temperature control and lowers the chance of future coolant system problems.
Explore More:
- Check out all Chevrolet Colorado parts & accessories
- Explore Thermostats Maintenance & Repair Guides
- Explore Cooling System
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