2003 Buick Century Q&A

2003 Buick Century Question: Radiator,waterpump,hoses,thermostat changed car still runs hot whats wrong?

car running in 1 spot in traffic on a long run -
Answer 1
get exhaust looked at. possible issue with cat. conv. -
Answer 2
are the cooling fans working? -
Answer 3
heater control valve/ or the heater core -