It is installed there as it is one of the best locations to avoid engine temperature playing trick games on the real outside temperature.

I had a Lincoln that had the sensor behind the radiator grille and every time the car was started after it had been used before the outside temp read 110 when it was a fresh 74 outside.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]