Thermostat '04 H2

[ptownhummer]

I already bought the Thermostat, i just can't figure out if it's as simple as removing the end of the large hose or if I need to remove the front of the housing? Also, I noticed yesterday that I had a small amount of fluid under the front end. It didn't appear to be coming from any of the hoses, looking under the vehicle it appeared to be running down the passenger side of the engine block down the side of the transfer case and oil pan. Is it possible the water pump may be bad? Thanks for any help. Hope to post some photos of the H2 soon.

'04 Hummer H2
6" fabtech
Mickey Thompson ATZ 36x15.50x20
20x12 Dick Cepek DC-1