Fixed the mysterious radiator fluid leak. There was a bolt that is somewhat hidden and was causing the leak. I put a 14mm bolt to stop the radiator fluid from leaking.
A water pump is attached to the engine block behind the radiator; if it leaks fluid this is usually the result of a bad seal on or inside the pump. Freeze plugs are in the side of the engine block and can leak coolant if they become corroded. Heater cores connect to the cooling system to deliver heat inside the vehicle; if cores or their hoses fail, radiator fluid will leak, often inside the vehicle. Head gaskets are between the engine block and the cylinder head and a defective one can allow coolant to enter the intake port and crankcase or drip down the outside of the engine.
For a few weeks now I have been troubleshooting for a small static radiator fluid leak near (red) drain plug - driver's side. The power steering hoses (upper and lower) clamp to the end of a brass fitting on the driver's side of radiator. Found both brass fitting loose and the upper one was seeping very small amounts radiator fluid. This brass fitting turns independent of the power steering hose meaning you can get a 13/16" inch (about 20mm) open end wrench onto the brass fitting and tighten it. No need to remove anything to tighten the brass fittings.
Radiator fluid is part of a vehicle's cooling system that draws heat away from the engine. Radiator fluid leaks can result from a number of problems, such as bad seals, damaged hoses and bad head gaskets.