..This new Water Coolant Temperature Sensor 3985651 works perfectly with FM12, FH16 and FH12 trucks. It precisely monitors instant coolant temperature and transmits dependable signals to avoid engine overheating. Crafted with high-grade sensor components and sturdy enclosed housing, it runs consistently amid tough under-hood operating surroundings. Made to meet rigorous OEM standards, it delivers ideal installation matching, fast signal reaction and longer service lifespan for regular truck upkeep.