Four Seasons 37878 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor for Kia

Four Seasons 37878 is an engine coolant temperature sensor built for accurate coolant temperature reporting to the engine management system. It uses a female rectangular connector, 3 terminals, and an M12 x 1.50 thread size for a direct-fit style replacement on listed Kia applications.

The Four Seasons Coolant Temp Sensor line focuses on OE-style replacement parts that meet or exceed OEM requirements. Four Seasons 37878 is specified for Kia Rio, Sephia, and Spectra applications where precise coolant temperature input is needed for proper engine operation.

Key Features

• Engine coolant temperature sensor for cooling system and engine control input
• Female rectangular connector with 3 terminals
• M12 x 1.50 fitting thread size
• Meets or exceeds OEM requirements
• Direct replacement part number 37878

Detailed Description

Four Seasons 37878 is an engine coolant temperature sensor used to monitor coolant temperature and send that signal to the vehicle control system. On Kia Rio, Kia Sephia, and Kia Spectra applications, this sensor supports accurate temperature feedback that the engine computer relies on for fuel delivery, idle control, and cooling fan strategy. This part cross-references Global Parts Distributors LLC 1712628 for the same application.

Compatible With: Fits 2005 Kia Rio, N/A, to 5/05; Coolant Temp Sensor. Fits 2001-2004 Kia Rio, N/A, Coolant Temp Sensor. Fits 1999-2001 Kia Sephia, N/A, Coolant Temp Sensor. Fits 2000-2001 Kia Spectra, N/A, Coolant Temp Sensor. Four Seasons 37878 is a direct-fit coolant temp sensor for these listed vehicles.

Common Issues This Part May Address

• Incorrect coolant temperature readings on the dash or scan tool
• Hard starting or rough idle related to temperature input errors
• Cooling fan operation that does not match engine temperature
• Fuel mixture or drivability concerns tied to faulty coolant temperature data
• Check engine light conditions related to coolant temperature sensor faults

Installation Notes and Tips

Verify the connector shape, terminal count, and M12 x 1.50 thread size before installation. Confirm the vehicle build date for 2005 Kia Rio applications, since the fitment note specifies coverage to 5/05. Always compare the old sensor to the replacement part and inspect the connector for corrosion or damaged terminals before reconnecting.

Quality Assurance

Four Seasons lists this coolant temp sensor as meeting or exceeding OEM requirements, supporting OE-style fit and function for the specified Kia applications. Part number 37878 is built for direct replacement use on the listed Rio, Sephia, and Spectra models.