Sure looks like the waterpump but turn the truck off and lay under the front and look from the bottom. The waterpump has a hole in the bottom, called a weep hole. It alerts you when your bearing seals have gone so you can change it before the oump freezes on on you
Hard to tell from that picture. But, if you can't see water leaking up around the thermostat housing or top of the water pump, then it's most likely what Superj said.
you can purchase, rent, or borrow cooling system pressure testers from various auto parts retailers.
that allows you to pressurize the cooling system without the engine running.
much safer when you need to get up close to find the leaks.
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