so my car hasnt over heated since i replaced the valve cover gasket but yesterday and today it has been over heating again and when the temp guage goes up to the hot point H the heat actually goes cold but car doesnt die it just boils the coolant outta the resivor and on to my belt which squeals but the temp guage dont go fast to hot it goes gradually any clue?? i changed the thermostat the upper and lower hoses so im clueless.....

Bad head gasket or large air bubble moving around in the system. Do you have to add coolant every now and then?

yes i have to add some but its not leaking on ground or anything

Then it could possibly be your head gasket and you might be burning it up. You should do or get a compression test done. First thing I would start with though just to rule it out is make sure you bleed all the air out of the cooling system.

and bleeding the air out can be done how i just squeeze the upper radiator hose with car on an cap off what do u suggest

So I know its somewhat stupid... but I just banged my head against this for a while... is your radiator cap old? Mine would leak after a while, the engine's heat evaporated the coolant immediately. I spend a while to figure it out, was already thinking something wrong with pump/gasket.....

Who knows? maybe its a 2 dollar fix?

no just replaced it with a pressure safe cap it has the latch on it to relieve the pressure when it gets way to hot. and when u lift the latch it boils into resivor

I was cleaning my car out 3 hours ago and it even overheated in the driveway what that hell..