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I don't know what's making you think that. That light is just another name for a check engine light.
The check engine light is a warning light that comes on if the computerized engine control system detects an engine performance or emissions problem. Also called the "malfunction indicator lamp" (MIL) or "Service Engine soon". It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and some not as serious.
Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone in your area, they will read them for free.
I know what it is and not it's not for overheating. It's for stored powertrain codes.
AND being the key word there. This is merely one function of that light and it can come of for a whole pile of other reasons.
It's a malfunction indicator. Overheating is ONE of the malfunctions it's programmed for.
After another expert reads this, do you really think they will want to get involved?
You must think I stsarted doing this yesterday.