K3/100 gets hotter running remote (terminal mode) vs. 100W out

[Barry]

I operated my K3/100 remotely this weekend in ARRL DX.  I noticed the top of the case getting pretty warm - not too hot to touch, but warm enough I wouldn't want to keep my hand on it.  The fan never came on.

Is this normal?  If so, perhaps firmware should be updated to sporadically run the fan and suck some air through.

Barry W2UP