Has the water tank been cleaned? If you don't clean it for a long time, there may be foreign objects that hinder heat dissipation, especially in summer.

Too many.

Then there is whether the partition next to the radiator of the water tank has been removed, which may happen after it has been removed.

Always check the water level of the water tank to ensure that the water level is normal and does not leak.

If it is an old excavator that has been in disrepair for a long time, you can open the cover plate on the engine and connect a small fan. Of course, this is the only way out.

I hope I can help you.