what do I do to cause it to stay at a normal temp ? on 1994 Chevrolet Camaro

My car has been overheating and as soon as it hits 240 to 260, it cools down. I have put antifreeze/ coolant in it. but it gets hot and then cools down.

by in Terre Haute, IN on July 27, 2013
1 answer
ANSWER by , July 27, 2013
Start by replacing the thermostat.