Dorman 902-5178 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing for Prius C

This Dorman engine coolant thermostat housing assembly is built for the 2012-2021 Toyota Prius C and matches the stock housing’s fit and durability requirements. Dorman 902-5178 is engineered for reliable coolant control in vehicles that need a direct replacement thermostat housing with an integrated cover.

Key Features

• Direct replacement engine coolant thermostat housing assembly for Toyota Prius C applications
• Plastic housing with black finish
• Includes thermostat and gasket for a complete thermostat housing service
• 180 degree thermostat opening temperature
• Two mounting holes and one outlet port
• Designed to handle repeated temperature swings in the cooling system
• Cross-references Gates 34832 and Motorad 752-180 for the same application

Detailed Description

Dorman 902-5178 is an engine coolant thermostat housing assembly made for 2012-2021 Toyota Prius C models. It is shaped to match the original housing assembly and uses a plastic construction with an integrated cover design. The included thermostat opens at 180 degrees, helping regulate coolant flow as the engine reaches operating temperature. The gasket is included, making this a practical replacement for a worn, cracked, or leaking thermostat housing on a Toyota Prius C.

For buyers searching for a Toyota Prius C thermostat housing assembly, Prius C coolant thermostat housing, or Dorman 902-5178 replacement, this part provides the core components needed for a thermostat housing repair while maintaining OE-style fitment.

Common Problems This Part Can Help Solve

• Coolant leaks from a cracked thermostat housing
• Engine temperature fluctuations caused by a failing thermostat
• Coolant seepage at the housing-to-engine sealing surface
• Overheating concerns related to restricted thermostat operation
• Service issues from a damaged integrated thermostat housing cover

Installation Notes and Tips

Verify the vehicle is a 2012-2021 Toyota Prius C before ordering. Inspect the mating surfaces, coolant passages, and surrounding hoses before installation. Replace any contaminated coolant as needed and follow the vehicle service procedure for bleeding and refilling the cooling system after installation. The housing uses two mounting holes and does not include mounting hardware.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match the fit and durability of the original housing on specified vehicles. It is built to withstand extreme temperature changes for extended service life in normal cooling system operation.