yeah, no leaks the prob i think with the coolant temap sensor is either the sensor or a short in the harness somewhere as it is a used harness. and its not a consistent problem,
you can have the truck idling in park and it will be fine and if you move it outta park the temp gauge goes from about 170 over past 210 and the idle drops to about 300rpm for a split second and then the gauge goes back to about 170, any time you move the shift column it does something to the temp gauge...oh and some times when i start it the temp gauge goes all the way up and wont start, you can let off the starter and try again and it will be fine,