Hyundai Elantra 2021 Thermostat Assembly: Part #255002E085

Hyundai Elantra 2021 Thermostat Assembly: Part #255002E085

This Hyundai Elantra 2021 Thermostat Assembly (part number 255002E085) is a genuine Hyundai/OEM part manufactured in South Korea, ensuring high quality and performance. It’s brand new and offered at a competitive price.

Thermostat Function and Importance

The thermostat is a critical component of your vehicle’s cooling system. Its primary function is to regulate engine temperature and prevent overheating. It achieves this by controlling the flow of coolant between the engine block and the radiator.

A spring within the thermostat regulates coolant flow. When the engine is cold, the thermostat closes, preventing coolant circulation and allowing the engine to warm up quickly. Once the engine reaches its optimal operating temperature, the thermostat opens, allowing coolant to flow to the radiator for cooling. Failure to open or close properly can lead to overheating or inefficient engine operation.

Thermostat Assembly Components and Operation

The thermostat assembly comprises several key parts:

• Main Valve: Controls the primary flow of coolant. As coolant temperature rises, this valve gradually opens, allowing increased coolant flow to the radiator.
• Secondary Valve: Works in conjunction with the main valve to regulate coolant flow, ensuring efficient cooling even under varying conditions.
• Wax Pellet Cylinder: Contains a special wax that expands as it heats up. This expansion causes the main valve to open, directing coolant to the radiator. Conversely, when cool, the wax solidifies, closing the valve.
• Seal: Prevents unwanted coolant leakage past the main valve. Proper seal placement and cleanliness are vital for efficient operation.
• Spring: Returns the main valve to the closed position when coolant temperature falls below a certain threshold (approximately 87°C).

The thermostat, while a small part, plays a vital role in maintaining optimal engine temperature. This contributes to fuel efficiency and extends engine life. It’s typically located on the coolant line running from the engine to the radiator.

Thermostat Operation in Detail

The thermostat reacts to changes in engine coolant temperature. When the coolant is cold, the thermostat remains closed, preventing coolant circulation. As the engine warms up and the coolant reaches a specific temperature (around 87-95°C), the thermostat opens, allowing coolant to flow to the radiator for cooling. This precise temperature control is crucial for preventing both overheating and inefficient engine operation.

Compatible Vehicles

This thermostat assembly is compatible with the following vehicles:

• Hyundai Kona (2018-2023)
• Hyundai Elantra (2017-2021)
• Kia Seltos (2021-2024)