256002B003 Hyundai / KIA CONTROL ASSY-COOLANT TEMPERATU, Price: 85.45$, Weight: 0.278kg

Engine Coolant Thermostat Control Assembly for Hyundai and Kia ️

This thermostat assembly keeps your engine at the correct working temperature. It opens and closes coolant flow between engine and radiator, helping the motor warm up fast and stay stable under load. Proper temperature means better fuel economy, strong cabin heat in winter, steady power, and longer engine life.

Why you need it

Engines are designed to run near a specific temperature. With a healthy thermostat, ECU mapping, lubrication, and emissions systems all work as intended. It prevents overcooling on cold starts and overheating in traffic or on climbs.

How it works

Inside the housing is a wax-pellet valve. As coolant heats up, the wax expands and pushes the valve open, sending hot coolant to the radiator. When coolant cools, the valve closes and routes flow through the bypass. The cycle repeats, keeping temperature in the target range.

If it’s failing ⚠️

Stuck open: slow warm-up, high fuel use, weak heater, fault code (often P0128). Stuck closed: rapid overheating, boiling coolant, loss of power, risk of head-gasket damage. Leaks from the housing or O-ring cause coolant loss and hot spots.

Replacement tips

Use new gasket/O-ring, clean sealing surfaces, torque bolts evenly, refill with correct spec coolant, and bleed air from the system. After install, verify fan operation and stable gauge reading.

Compatibility

• Hb20
• Creta
• I30
• I30 Cw
• Ix20
• I20
• Accent
• Venue
• Avante
• Avante Hybrid
• Elantra
• Veloster
• Solaris
• Verna
• I10