I did my own version of the much talked about upgrades to the dometic
fridge fans.  I replaced the exterior fan with a quiet computer fan, and
added a fan inside on the cooling fins with a switch to control it.  I took
some photos and made a little web page here:
http://buncombe.main.nc.us/~emaglott/pp014/index.htm

Now a question.  Those of you who have made it possible to override the
thermo control fro the exterior fan and have it run constantly.  Do you
find that this helps your cooling?  Thanks,
Edward