if it got bad in a hurry it prob is water pump but I have also had a thermostat housing leak and one hose leak I thought might be water pump so clean it off real good then let it dry and run it while looking real close.
the water pumps aint fun so make sure.
Keith in Alaska (lovin it)
95 7.3 ex cab L/B 4X4 (D66 stage 1s 4" Turbo back 6637 air filter and bully dog chip)
05 6.0 Excursion 4X4 (stock)
10 6.4 F350SRW CCLB manual trans (stock)