Thanks for the ideas cdnsarguy, this morning when I whent to start the truck the temp gauge shot to the top and check engine light came on. Disconected the wire on the lower side of the front head and light whent out, checked the wire and sprayed wd 40 on it. Seems to be okay now, phoned for a new temp sensor from Ford $90. think I'll wait and see if keeps working befor replacing the part. thanks again