Which of the following should be inspected to prevent overheating in a 12N Crawler Tractor?

To prevent overheating in a 12N Crawler Tractor, it is essential to inspect the radiator and coolant levels. The radiator is a critical component of the cooling system, responsible for dissipating heat generated by the engine during operation. If the coolant levels are low, or if there is a blockage in the radiator, the engine may not be able to cool effectively, which can lead to overheating. Adequate coolant not only facilitates heat transfer but also helps to protect the engine from corrosion and other damage. Regularly checking the coolant levels and ensuring that the radiator is free from debris or leaks ensures optimal engine operation and longevity.

While other components like fuel filters, cabin air filters, and starter motor connections play important roles in the tractor's performance, they are not directly involved in the cooling process, hence their inspection is less critical for preventing overheating.