The raditor needs to be replaced. they get coated with a thin layer of contaminates that prevent heat exchange at a high enough rate. they may have some of the cores stop;ed up also. It worked for mine at about 180k miles. Expect the thermostate to go out unless a premium one was bought. not buy autozone they are worthless. Change the cap too.
check your thermostat
If your car is over heating you may want to check your thermostat and replace it may solve your over heating problems
check thermostat is it opening at all check timing
check the fan clutch
Check your engines thermostat
check your thermostat to see if its opening.
it can be many stuff but in your place i would check first the coolant level and the thermostat
If a 2001 Chevy Impala will not start after replacing a thermostat, perhaps it is possible that a sensor was bumped unknowingly. Check all of the sensors that might have been touched during the changing of the thermostat to see that they are all still plugged in.
check the thermostat dude may need replacing
check your antifreeze and water...maybe water pump too.check for a thermostat that is not closing ,.in other words a faulty thermostat
first check your coolant level. then check to see if you have a leak, then check to see if you cooling fans are coming on then check if your thermostat is working.
check to be sure that the thermostat is not backwards and is the correct heat rated unit for the car