Behind the grill
 

Can some one tell me what the small sensor is almost right behind the "V6" in the grill of my 1991 4Runner attached to the rad I think (quick look). It looks like a temperature sensor or ballast or something (aluminum rectangle). The wires are broke off either end. There is a red and black wire. Maybe this is part of my troubles.

It looks to be part of the A/C system. What kind of problem are you having?