Many customers frequently ask why diesel generator sets tend to experience high coolant temperature alarms after being used for a period of time？

Based on our repeated practical experience, this issue occurs because scale builds up in the generator set's radiator, 

blocking the circulation system and hindering proper heat dissipation, which leads to high coolant temperatures. So, why does the radiator become clogged?

Generally, customers often overlook the instructions in our user manual, especially the requirements for adding coolant to the generator set's radiator. 

It is crucial not to add ordinary tap water or deep well water into the radiator. These types of water contain high levels of minerals, 

and after the generator set has been in use for some time, they tend to form scale. The higher the mineral content, the more severe the scaling, 

making the radiator more prone to clogging.

Therefore, it is essential to add soft water—commonly referred to as purified water—into the radiator. In fact, the best option is to use antifreeze coolant. 

This ensures that the diesel generator set will not experience high coolant temperatures regardless of how long it operates. 

However, since diesel generator usage leads to some loss of antifreeze coolant, it is important to replenish it periodically. 

Avoid letting the radiator operate under high-temperature conditions for extended periods.

Additionally, for customers using Weichai generator sets in southern regions, there is no need to add antifreeze coolant. 

Simply using ordinary purified water will suffice, which can help reduce operating costs.

Furthermore, whether the radiator is filled with water or antifreeze coolant, it should be cleaned regularly to prevent debris from accumulating inside, 

as this can also cause the generator set to trigger high-temperature alarms.