I found where the sensor is. I need to go physically look at it, because I very recently had new headlights installed (old ones were hazed) and the shop very well may have done something to this. One of the bolts that holds the headlight assembly in place fastens the temp sensor. I actually just noticed the -40 reading a couple days ago....so no telling how long this condition has existed.... On a separate note.....When did you retire from USAF? I retired 1 Dec 1992 after 22 years.