yesterday a yellow and a few seconds later a red thermostat warning light came on while i was on the interstate, i start losing some power while getting off the exit but a few seconds later it picked back up power. I let my car cool down for 45 mins and checked the coolant, i added about 25% to 30% of the coolant so my coolant was not completely low. I started my engine back up again and the lights did not come back on and i was able to travel on the interstate another 200 miles. What are some of the possible issues? i am nervous about getting back on the road because i have about 300 miles to travel back home.