Will this plug directly into my truck's wiring?

The mirror is wired for factory harness compatibility on this generation Frontier. You'll need to verify connector type before installation—snap a photo of your current mirror's plug and confirm it matches before committing to the swap.

Do I need to remove the door panel to install this?

Mounting uses factory rocker points—no drilling or panel removal required. Unbolts from the outside, then disconnect the electrical connector and swap in the new assembly.

Does the heater function depend on engine temperature or can I run it anytime?

Heating element operation depends on your truck's electrical system—it typically activates through the dash switch whenever the engine is running. Exact behavior follows factory logic; consult your owner's manual for specifics on heat duration and power draw.