: Applications like Spatial Manager or CAD-Earth offer specialized "one-step" buttons to export drawings while preserving colors, layers, and transparency.
: These advanced versions include built-in commands like MAPEXPORT to generate KML/KMZ files directly. Dwg To Kmz Converter Free
Use QGIS . It has no file size limit. Alternatively, split your DWG into smaller layers in AutoCAD (use LAYER command and WBLOCK to export specific layers to new DWG files). : Applications like Spatial Manager or CAD-Earth offer
Since QGIS is the most reliable free tool, here is a detailed walkthrough. Dwg To Kmz Converter Free
You have exported with 3D coordinates (Z-values) that are incorrect. In QGIS, during export, set Altitude mode to clampToGround . This forces the geometry to drape over the Google Earth terrain.