I just bought this car a week and a half ago with approximately 43,000 miles, until last night I didn't have any problems. I pulled the car in the garage and went back out to the garage about 2 hours later to discover what I think to be big puddle of coolant on the garage floor. I can't see where the fluid is coming from.

I am wondering...and optimistically, I know...if it is possible that the coolant had been overfilled when I bought it. It just recently got hot here, it was over 100 degrees on Tuesday and close to 90 degrees yesterday. I am wondering that with the recent increase in temperature if that possibly could have allowed to coolant to get hotter than it had the previous week and a half. The coolant level seems to be close to where it should be. Any help on this would be appreciated.
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Do a visual inspection of the motor, radiator, hoses, overflow tank, etc. See if you can see anywhere that is wet or looks like it is leaking. Probably not too much to worry about yet since the coolant level shows full. Just keep an eye on it for now.