When the NFS Carbon Save Editor displays an "Invalid Car Heat Value" (often a massive negative number like
Compatibility: The tool is essential for running the game on modern systems like Windows 10 or 11, where registry mismatches often prevent the game from loading original saves.
Backups are Mandatory: Because these editors modify internal data structures, always create a manual backup of your save folder (found in Documents\NFS Carbon) before attempting a fix.
Outdated Editor: Ensure you are using the latest version of the NFS Carbon SaveEditor (v1.27 or newer) to avoid bugs with newer operating systems.