EVIL ENERGY Thermostat Housing Assembly for GM 1.4L ECOTEC — Complete OE-Fit Kit with Gasket

EVIL ENERGY thermostat housing assembly is a direct-replacement coolant thermostat kit designed to restore correct engine warm-up and coolant flow control for 1.4L ECOTEC four-cylinder vehicles.

This complete assembly replaces worn or leaking thermostat housings on specified Buick and Chevrolet 1.4L models. It combines a calibrated thermostat, a durable plastic housing, and a new gasket so you can reseal the cooling circuit and reestablish proper warm-up behavior. EVIL ENERGY engineered the unit to match the fit and function of the original equipment part numbers it supersedes for a straightforward installation.

Which vehicles and original part numbers does this housing fit?

The assembly is designed for ECOTEC 1.4L L4 gasoline engines used across several GM compact models from 2011–2021. It replaces multiple OE references so you can confirm compatibility using your vehicle's part lookup or VIN.

• Compatible models: 2013–2021 Buick Encore 1.4L; 2012–2020 Chevrolet Sonic 1.4L; 2013–2021 Chevrolet Trax 1.4L; 2011–2016 Chevrolet Cruze 1.4L; and 2016 Chevrolet Cruze Limited 1.4L.
• Replaces OE part numbers including 55565336, 55579010, 55593034, 34709, 902-808, 730-221, 85993, 25200455, 131-180.
• Verify fit by cross-referencing your current part number before purchase.

How does this thermostat housing affect engine warm-up and cooling?

The thermostat within the assembly stays closed until the engine reaches its designed operating temperature, which helps the engine reach efficient temperature sooner and stabilizes coolant flow once open. That reduces late-cold wear on engine components and helps the vehicle’s heater and emissions systems operate as intended.

• Opening temperature: 217.4°F (factory-calibrated valve).
• Seals coolant pathway to prevent leaks until the thermostat opens.
• Promotes consistent coolant circulation after opening for stable engine temperature.

What comes in the EVIL ENERGY thermostat housing kit and what tools or materials will I need?

The kit arrives ready for installation and includes the main components required to replace the thermostat housing. You’ll still need basic hand tools and new coolant to refill the system after installation.

• Included: one thermostat, one rubber gasket, one plastic housing, and one pair of nitrile gloves.
• Recommended: socket set, torque wrench, drain pan, coolant, and a clean rag for sealing surfaces.
• Installation note: inspect hoses and clamps; replace any worn items to ensure a reliable seal.

Is this an OEM part and how reliable is the material?

EVIL ENERGY provides a replacement designed to match the original’s fit and function but is sold as an aftermarket component. The housing is molded from high-grade plastic engineered for thermal resistance and dimensional stability in an engine bay environment.

• Aftermarket replacement built to automotive fit specifications.
• Plastic housing formulated to resist heat cycling and coolant exposure.
• Supplied gasket helps ensure a leak-free joint when installed correctly.

Who this is for: This EVIL ENERGY thermostat housing assembly is aimed at DIY mechanics and professional technicians who need a cost-effective, direct-fit replacement for failed, leaking, or aged thermostat housings on GM 1.4L ECOTEC engines. It’s useful when restoring proper warm-up behavior, eliminating coolant leaks at the housing, or performing scheduled cooling-system maintenance. Confirm vehicle compatibility with your year, make, model and engine size before ordering to ensure a correct fit.