You do not need to completely remove the dashboard in order to change the heater core. Remove the water hoses from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
a C1500 is a half-ton pickup, a C20 was a 3/4 ton. Chevrolet half ton trucks used to be called C10s.
Gm does not use inertia switches.
under the dash on the passenger side.
It's part of the electronic engine controls.
Remove the wiring harness from the wiper motor. Remove the wiper arm linkage. Remove the wiper motor retaining bolts. Reverse the process to install the new wiper motor.
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You remove grill to remove and replace the headlights.