The upper steering shaft (rectangle) and holes for cross member (arrows) and fire wall (oval). Do not loose black plastic parts (oval).
Protect the upper steering shaft by wrapping with something clean like saran wrap.
The driver side looks like this after removing the steering column assembly.
Disconnect the driver's side defrost hose at the central duct.
The wiring harness connectors (rectangles) on the left side of the inner panel will be disconnected from now. See the details in the following pics.
More Heater Core Replacement
4x4 Off-Road Homestead Firearms RC Models