2004 GMC Canyon Engine running hot.

First thing get or have someone usea n infrared thermometer to make sure it's running hot. Then have the engine pressure checked. You might have a head gasket going bad. Also there'sa good possiblility that you've lost ground and the gauge is reading hot but it really isn't. One other thing, but you wouldn'tknowthis until your head comes apart is that the red antifreeze if not filled correctly will gell up inside the engine block andthere will be no cooling around the cylinders. That is a rareity though.