Originally Posted by jfreeman62
..... Any advice or links to manuals appreciated.
My advice would be to replace them with Fantastic (Vent) Fans.
I replaced all of the original fans on both the '87 Classic Motor Home and the '78 Sovereign
with great success. Fantastic Vent supplies a good replacement step by step manual if you tell them you are working on an AS. Also, request the rounded interior trim. The special AS trim fits the rounded dome of the AS.
Lots of "how to" for the AS vent replacement here on the Forums and on the internet.
Since you are living in the trailer, I would also suggest you get the "deluxe" version of the vent fans. The best ones are bi-directional, have thermostats, variable speeds, and are auto closing if it starts to rain. I have found a benefit for an outer cover over the vents also - just be sure that the outer vent is tall enough to let the Fantastic Vent automatic cover raise up far enough to allow proper air movement.