现代索纳塔8代通用水温传感器39220-38010，精准控温保护引擎

This replacement water temperature sensor has material and process essentially identical to the original; uses high-temperature engineering plastic housing and sealed copper core, durable in tests, stable for 3-5 years without signal drift due to thermal expansion. OEM number 39220-38010, compatible with Hyundai Sonata 8th gen and some Kia K5 models; direct replacement of original part. Function: monitors coolant temperature in real time and sends precise signal to ECU to keep engine within optimal temperature range, preventing overheating or overcooling damage. Installation/replacement difficulty: relatively low; unplug plug, remove old sensor, thread in new part to standard torque, reattach plug, ensure cooling system is bled of air.