Engine Overheating (Possible Causes)

Preliminary Diagnosis
1. Does overheating occur while pulling a trailer? Is the trailer within the recommended towing weight?
2. Is overheating occurring after prolonged idle in near. A/C system operating.
3. Is overheating occurring after prolonged driving in slow city traffic, traffic jams, parades, etc.?
If none of the above apply refer to the table below.