Closing parts in Car Model

I’m handing over an existing 3D car file that still has visible gaps along the exterior body panels. All I need is for those openings to be closed cleanly so the surface reads as one continuous shell with closing the wheels to flat surface —no extra detailing, texturing, or interior work.

You’re free to use Blender, Maya, 3ds Max, ZBrush or any other mesh-repair workflow you prefer, as long as the topology remains clean and the file comes back to me in the original format (or a compatible, loss-free alternative).

Deliverable:
• Updated model with every exterior hole, seam, or non-manifold edge fully sealed and ready for the next production step.

A quick turnaround is appreciated; I simply want a watertight exterior so I can proceed with shading and rendering.