1998 Pontiac Sunfire overheating, temp.

My 98 sunfire is in realy great condion, it was ver well taken care of. Well all except the over heating prob, thers never a prob first thing in the morning to start or if its been sitting for atleast a hour or two. Now if were driving an the temp reaches the sec line on the temp gauge, it quickly starts having symptoms of a vapor lock. Now if the car is parked an then started again, unless that car has cooled down t were it reads below the sec line, it just cranks an cranks an cranks.