So i noticed my car temperature getting hot and the heater blows only cold air. First thing i did was change the thermostat. That didn't fix it, so i changed the radiator next, that didn't fix it. I Notice that at first the heater does stat getting warm but after i drive it a little bit it will start getting cold again and the temperature gauge will start going up. I've tried bleeding air out by jacking it up and running with the radiator cap off but doesn't seem to do much. One question i have is someone told me that when you install the thermostat the little hole on it has to be in the 12 oclock position which i didn't do. Could that be the reason it still overheats or am i looking at maybe the water pump? Also the big hose at the bottom of the radiator doesn't get hot like the other hoses.