Fan stopped working and it was running hot. This day it didn't register hot but it lost pressure. When I popped the hood I saw the hose had came off that runs to the radiator. Hose has been fixed, new fan, and thermostat, when you try to crank it sounds like it is going to start but then nothing. Mechanic thinks it could be seared head but I saw no smoke before it shut down. Does it need to be reprogrammed?