what else would make a thermostat stick. its brandnew. and the radiator is new along with the hoses. the radiator sits real low and the fill cap is underneath the bleed valve on the block. when it starts to get hot i floor it and the second the turbo kicks in somehow the thermostat opens and you can see the temp gauge go down..I have to open the bleed valve just to put coolent in it. anyone have any different ideas?