Thanks Les
Now I think I've got it. I was thinking the AC switched on the HS fan, rather than the low speed. And I thought I was in trouble because I am currently running the L/S fan on all the time ( cut #14 ) with very good results, but panicked at the thought of H/S coming on and frying things. Ok, now I know this can still happen if my H/S fan ever decides to come on, but she's running so solid on "N" with or without AC even here in Florida that I doubt she will for the time being... so...until Dave revises that FAQ at TBSCEC and I can decide what I want to do with the setup, I'll just keep my fingers crossed that she continues to run this consistently cool.
Looks like I'm still gonna need that adjustable thermo Chuck had and some switches , in order to protect the fan motor in the long run.