How to find the coolant temp fuse on 1990 Isuzu pick up truck?

To locate the coolant temp fuse on a 1990 Isuzu pickup truck, first consult the owner's manual for the fuse box diagram, which will indicate the exact location of the fuse related to the cooling system. Typically, the fuse box is located under the dashboard on the driver's side or in the engine compartment. Once you find the fuse box, look for a fuse labeled for the cooling fan or temperature sensor. Carefully inspect the fuse for any signs of damage or a blown filament, and replace it if necessary.