heater core disassembly of heater core cabinet? on 1990 Chevrolet G Series Van (G10)

trying to replace the heater core, but don't know how to get the cabinet apart, does it unbolt from both inside under the dash and outside through the firewall?

by in Oklahoma City, OK on December 20, 2010
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1 answer
ANSWER by , July 01, 2011
Did you ever find an answer? I need to do the same in a 91. Thanks.