What part is it Dodge Durango

[lou417]

Hello. I have a 2006 dodge durango, 4.7 liter. I drove it 5 miles and the temperature gauge shot up.Got it home and it started spewing coolant.It's coming from the casing behind the thermostat housing. Not sure what part it is or what caused it to leak. It's on the passenger side of engine. Has a pulley on it. It's my daily driver. Any help would be greatly appreciated. Thanks

[carriedi]

does it look like the coolant is coming from under the pulley? (water pump)