GMC Repair: heater core, heater hoses, coolant recovery

Question
Do I have to remove the dash on my 1998 gmc sierra to change the heater core???

Answer
1.   Drain the coolant.
2.   Remove the instrument panel storage compartment.
3.   Disconnect the electrical connectors, as necessary.
4.   Remove the center floor air distribution duct.
5.   Remove the hinge pillar trim panels.
6.   Remove the blower motor cover.
7.   Remove the blower motor.
8.   Remove the steering column.
9.   Roll back the instrument panel.
10.   Remove the coolant recovery reservoir.
11.   Remove the heater hoses. Refer to Heater Hoses Replacement .
12.   While holding the heater case to the cowl, remove the screw on the interior side of the cowl, near the evaporator pipe, if equipped.
13.   On the engine side of the cowl, remove the 4 screws that hold the heater case to the cowl.
14.   On the engine side of the cowl, remove the 2 nuts that hold the heater case to the cowl.
15.   Remove the heater case.
   Ask an assistant for help, if necessary.
16.   Remove the 7 screws that hold the heater cover to the heater case.
17.   Remove the heater cover.
18.   Remove the heater core from the retainer.