Nice site never know what you will find when you type in 4.9 litre?
Now for a question anyone familar with 4.9 cooling system?
Mine seems to have developed a leak think it might be the water pump.
Mine does too but it's not the usual suspect. If it is not coming from the weep hole or shaft it may be coming from the gasket of the pump. It's a long skinny affair that has weaknesses on how it seals. A black light will show the antifreeze pretty well. bf