Where is the 2006 hummer h3 engine coolant temperature sensor?

The coolant temperature sensor is located on the passenger rear of the engine a couple of inches below the valve cover. Very cramped, not easy to get a wrench on. It's easy to see the connector and touch the sensor, but it's tight quarters and recessed a bit. Recommend a split deep socket, similar to the type for 02 sensors. Hope this helps.