Where is the rear blower motor located, and how easy/hard is it to replace? on 1997 Chevrolet Venture

My brother just replaced the front blower motor and we have heat in the front, however, the vents located in the rear of the van are not working.

Asked by for the 1997 Chevrolet Venture
1 answer
poss rt rear quater panel area by evap core under plastic cover