Engine overheating can come from a variety of sources. With combustion temperatures reaching 2000° F and higher, there is a lot of heat to dissipate. If your engine is running hotter than normal, either shortly after starting or over time, it's probably time for an inspection.
Check to see if any green, orange, or yellow fluid has puddled under the vehicle. If it has, you are probably losing coolant, which could indicate a leak in the system. Loose or improperly adjusted belts and hoses, leaking gaskets or components, and even mechanical engine damage could be the culprit.