For the last week, the coolant light blinks about 1 minute after I start the car in the morning.
If I open the coolant overflow tank it goes away till the next day. I can start the car 100 times and the light will not come on other than normal when you start.
I have done nothing to the system in the past 6 months. I thought it might have a bubble but where could it come from.
But what makes the light blink after a minute or so after starting and why does opening the tank, then closing it, make it go away?