2003 elantra with 90000 miles. serviced regularly. smelled antifreeze. looked under hood saw a slight spray of antifreeze near battery but couldnt find a leak. one hour later after car sat, noticed coolant at top of radiator where it looks like the unit is sealed. small 4 inch puddle on ground temp gauge has been in normal range. timing belt and water pump changed within last 5000 miles. is it possible the radiator is cracked ?