** Where on the Internet can I download [Kenmore heavy duty washer and dryer manuals]? **
I don’t believe there is anywhere where manuals for those particular Kenmore branded products can be “downloaded”. The only place you’re likely to get them at all would be directly from S ears in paper form and probably for a fee (ie. NOT free).
For Kenmore appliance models built by some of the other appliance manufacturers (S ears doesn’t build anything them self), see the following web page for links to those manufacturer’s sites.
The Appliance Information Site