I am using Solidworks 2012 Premium. I am running a simple simulation before I try something complex. I am looking at the expansion of a 10 x 10 x 1000 mm aluminum bar when the temperature increases from 20C to 80C. I have calculated the answer by hand so I will know if I have the right answer. I entered 20C as the temperature at zero strain. I cannot figure out how to specify the final temperature of 80C. When I go to Temperature in the external loads I can apply a temperature to faces and edges but not to the feature, in this case an extrusion. I have tried selecting the feature from the tree but this is ignored. I am sure I am missing something that is very obvious. Anybody have any thoughts about what I am missing?