Hatchet928, you needed to bleed the cooling system after any of those repairs using the head "bleed off valve" or there will be an air pocket trapped in the head. The temp sensor itself is kinda hidden in the middle /top of the head between plug 2 and 3 under a rubber boot down inside like the spark plugs. If your driving around like that you can warp the head or blow a head gasket pretty quick, it is over heating!