I agree with Mike on the water pump,but it could also be something different. My 96 Rodeo was leaking from a coolant hose that is on top of the engine. Its located on the top kinda in between the V of the cylinder banks. Its insanely hard to get to, the part cost like 3 bucks, but it takes forever to get to it. But, i would put my money on the water pump. 124k on a water pump sounds like a bit much.
HTH,
William