Thanks. That is what I used to do, too. I have not used the projector in many years. I checked Kodak's manual on-line, and was surprised to read:
To shut down, • remove and store the tray • slide the power switch to off Your projector will remain warm for several minutes
The manual listed the "fan" switch setting, but made no mention of when to use it.
http://resources.kodak.com/support/pdf/en/manuals/slideProj/carousel_user_manual.pdf