Radiator Problems?

[weberje]

I just purchased a 98 Trans Am yesterday (on my wedding anniversary!).
When I first test drove it (month ago), it overheated; leaking antifreeze. The seller took it to a mechanic who "fixed it". No specifics. But the indicator light comes on in the dash (unless you disconnect the sensor, which it was). I couldn't pass up the deal for the price, and finding an M6 in these parts is rough.
I flushed the radiator today; ran a cleaner thru it as well. If the light comes on again, what could be the problem?

[JEB]

A Stuck Thermostat. It may be a good idea to change it anyway. If my car started to overheat, that it the first thing that I would look at.

[weberje]

thanx!