Do I have a warped head or bad head gasket?
97 f150 5.4 have been having heater issues. Ive changed thermostat, flushed heater core, and radiator checked blend doors, and everything works as it should. Truck just doesnt put out much heat. Ive burped the system several times so i know theres no air in it either. When u first start the truck it goes give a small amount of white smoke but it doesnt stink any. No signs of coolant on oil dipstick and i never have to add antifreeze to it? System just acts like theres a problem somewhere not allowing it to build up any pressure! When the truck is at operating temp the upper radiator hose doesnt hardly carry any pressure at all? Im new to fords and im running out of things to look at or check any help is appreciated!!!!!!!! Thanks