My car overheats!!

[quote:6846481025="joshsGT"]My 1997 ford mustang gt, 4.6 engine, with 155,000 miles on keeps overheating. I replaced the upper radiator hose and thermostat but it keeps overheating. The car is serviced frequently and it has coolant. I don't know what the problem could be.[/quote:6846481025]

is it loosing coolant
if ya pressure check it

check water pump
check and or flush radiator acn coolant sys
check the beltand if its install correct