What is an unsafe coolant temp?
What is an unsafe coolant temp? The engine coolant is overheating if it's around 240 to 250 degrees. This is a critical light! It means your engine is beginning to overheat. How much coolant should be in the coolant reservoir? This excess coolant stays here until the system cools down enough to create negative pressure and draw the excess coolant from the reservoir back into circulation. While the engine is off, your coolant reservoir should be about 30% full. Why is no coolant in radiator but reservoir tank is full? Consequently, we will concentrate on the signs of no coolant...