I am having problems with my 96 caddy deville. It keeps heating up on me. First I changed my fan relays cause they weren't turning fast enough,(it helped) then I changed the water pump, and its still heating up. I took the thermostat off too. Right now I am flushing the radiator, lets see if that helps. Can anyone help me out with any pointers? What are the symptoms of head bolts unscrewing themselves? could that be the problem? The car at idle wont heat up, it stays around 220F, I can leave it on idling with no problems, but if I start driving it it will heat up, and spill the water through the top overfill hose.