On my way to work this morning and all the sudden the fan starts blowing cold air..three minutes later the needle starts to move to overheating range...shut car off...restarted and fan started blowing warm air again..ran fine for 5-10 minutes and did the same thing...fan air went cold and car started to overheat ?

got to work..parked car..Opened hood and didnt notice anyting unusual...car has been sitting for a week as I have been out of town...no puddles on my garage floor though ? will check coolant level this afternoon, however I dont believe that is the issue ?

Any ideas ?

thanks...

Matt B.
Northern VA...