On a few occasions now that the cold weather is starting to creep in, the coolant symbol flashes on a cold morning after start up. It flashes for a few minutes then goes out & only does it if it's a cold morning, you can start it in the afternoon when the weather is warmer & nothing flashes up. I looked it up in he drivers manual & it say that it's either coolant level too low or the coolant temp is too high. I've checked the coolant level (an hour after using it) & it was fine, I put a spot in as I thought maybe when it's cold it goes down a little but the symbol still flashes up for a few minutes on cold mornings. It's obviously not temperature too high so could it be?