Will this bolt straight to my car without rewiring?

Yes. The connectors match OEM factory harnesses, so you plug it in and you're done. No adapters or splicing needed.

Does the heater work independently, or does it run with the defroster?

That depends on your vehicle's wiring logic—some models trigger it automatically with rear defroster, others give you a separate switch. Your owner's manual will confirm which method applies.

What if I need to return this mirror?

ModSupply handles returns through its standard process. Inspect the unit and connectors before installation to catch any shipping damage immediately.