Where is the coolant temperature sensor which talks to the ECM on an Olds 88?
located at the drive belt end of the motor (3.0 and 3.8 engines}
3800 motors the sensor is located at the other end.
A 3.8 and a 3800 are the same engine just as a 3.1 is the same
as a 3100. I have never heard of a 3.0 GM engine.