I keep finding things wrong with this Rodeo. I noticed the temp gauge moves up about 1/4 way off cold as soon as the ignition is turned on. After being driven for awhile it never moves up. My first thought was the sending unit but ive been using a code scanner trying to find another problem and I noticed the temperature readings seem to be working right to the computer, which would make me think the sending unit is working properly. Any ideas on what would make the gauge do that?