The temperature sensor should be only in the AD26 only and the AD31 mention that disable the module, if you want to do it single ended disable the SC1n[DIFF].
Also, for more information, check the following document that explains how to convert the measurement to temperature.
Let me know if this helps you.
Thanks for ur effort. Can u tell me if I'm doing something wrong in above posted code ? Because I've tested same code on different K61 microcontroller and behavior is same. Though when I run this code on my K60 tower kit it works. I don't know what I'm doing wrong.