Where is the delivery mode door actuator located on 1999 Cadillac Seville STS

why in diagnosing the problem with the delivery mode door actuator you never reply to how to fix it or where it is located in the car to get to it?

Asked by for the 1999 Cadillac Seville STS
you have several mode doors. you need to determine which door in bad and its under the dash. some are easy to repl and others are known to take like 5 hrs to replace.have the a/c modlue scanned to determine code and which door the post info