The volcano itself is difficult to find if don't read any Chinese. From Tianliao itself, head east on Highway 28, over Freeway 3 to the community of Chongde (崇德). Then take Kaohsiung Road 141 on the right. After less than 1km, you'll see Chongde Elementary School (崇德國小). The mud volcano is a further 1.5km east; keep your eyes peeled for Chinese-language signs reading 泥火山. Opposite a chicken farm, you'll find some rough concrete steps going up into a bamboo forest on the right-hand side of the road. The volcano is less than 100m away.
In visual terms, Chongde's volcano is less exciting than the better-known eruption at Wushanding (烏山頂) about 9km to the south. There's no cone as such, rather a 1m-wide belching hole in the ground. I picked up a bamboo almost as long as I am tall and stirred the hole. This seemed to cause an outbreak of bubbling; the stick wasn't long enough to probe the bottom of the vent, pictured below.