1995 Corsica, 105590 4 cyl. When the car is started and allowed to warn up slowly the light does not come on. When I start it and just go, the light will come on a few miles down the road. If I stop and turn the engine off and wait a few minutes and restart the light does not come on. I have also noticed the the tempurture gauge goes past mid point and then goes back to normal just before the light comes on.