I have a 2005 Endeavor. I do not have a manual and this week a warning light has been coming on when I start the vehicle in the morning but then goes off after about 15 miles. The light does not come on again even if I don't start it for twelve hours. But the next morning the light will come back on. I cannot get into the shop until next Tuesday to have it looked at. Could anyone identify this light: (!), it is orange and has a wavy line under it. I don't want to continue to drive if this will cause larger problems.