Assuming you're using Flow Simulation, your approach sounds right. I just tested this out by setting up a simulation of a simple cylindrical part. I set a boundary condition on the outer walls of the part to be 100C, the initial temperature of the entire domain to be 20C and I started a transient simulation. This is what the goal plot looks like for the point at the center of the part:
So it should be feasible as long as you're setting up your analysis correctly. Where are you running into problems?