Car search is not currently advertised as a live booking feature in Viamente. A driving leg or rental-car plan can still be relevant journey context, but availability depends on what the current product and connected providers support.
Do not assume that a car is booked just because it appears in a plan. Verify rental details directly with the provider.
If you need car-search support for a specific journey, tell the Viamente team what route and dates you are planning.