There are many reasons for overheating, some of which are covered in the previous discussions. Standard checks are fan belt, radiator cleanliness, fan shroud engagement and radiator cap for sealing. However, it is very important to keep the coolant mixture at the right concentration all year round, ensure that the transmission clutches are not slipping (operator driving practice?) and that if an attachment is fitted, the hydraulic flow from the truck might need to be reduced through a flow divider. Advancing timing slightly can also help significantly.