Danger of Ice Warning lite

just got my 2000 cougar v6 but I have a light that stays on all the time it is the danger of ice warning check the temp outside display it thinks it is -9 but it really 90 outside any ideals
Thanks
Turbo223

there is an outside temp sensor mounted in the grill area - umplug the sensor and see what the gage does - if it changes most probably you need a new sensor - if not you have BIGGER fish to fry