  We present calculations of the temperature-dependent electrostatic and
chemical potential distributions in disordered normal metal-superconductor
structures. We show that they differ appreciably in the presence of a
superconducting terminal and propose an experiment to measure these two
different potential distributions. We also compute the resistance change in
these structures due to a recently proposed mechanism which causes a finite
effect at zero temperature. The relative resistance change due to this effect
is of the order of the interaction parameter in the normal metal. Finally a
detailed calculation of the resistance change due to the temperature dependence
of Andreev reflection in diffusive systems is presented. We find that the
maximal magnitude due to this thermal effect is in general much larger than the
magnitude of the novel effect.
