location of temp sensor on 1999 Cadillac DeVille

engine fan will not come on only when i turn the heat or ac on. location of temp sensor

Asked by for the 1999 Cadillac DeVille
The coolant sensor on the northstar engine in your 1999 Cadillac DeVille is located on the back end of the rear head. Not very easy to get to as I remember. The cooling fans should come on at about 230 degrees.
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the engine is overheating and is throwing water out