My car is overheating or is it? Driving down the highway the temperature gauge went from normal to all the way to the top in less then 30 seconds. The coolant light went on and the car went into shutdown mode. My car was running erratic. After reading the manual this is normal when the coolant light goes on (engine safeguard). My coolant is fine. I have no leaks. What could it be? When the car cools off it runs fine.
 
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