If floodwaters were more than a few feet deep water probably made it to the inside of your car.
Flooded car floor.
Even if invisible water can get into the small spaces of your car and remain there causing mildew and mold formations.
Most insurance companies will consider the car totaled damaged beyond economically reasonable repair if water reaches to the bottom of the dashboard or higher.
This is when distinct problems can begin to occur.
If this is the case then have your car towed to a mechanic for a professional assessment.
Since everywhere else is dry i believe there must be a leak on the chassis floor.
The car floor was flooded i mean it was really flooded i removed several ounces of water after we return on the rear driver side floor and the floor under the driver was wet when we drove through the rain storm for over 1 and half days recently.
Wash the carpets until the water runs clean off the carpet.
In the context of an automobile the term flooded might reasonably be used to describe when ponded or standing water has entered the passenger bay.
If your car windows or rooftop is left open during a heavy downpour there would be a lot of damage to your car.
Use a pressure washer if you have one available or use a garden hose with a full stream of water.
If possible hang the carpets up to wash them off and let the dirt run off easily.
An owner might consider his car ruined even though the insurers might not deem it a write off.
Ruined is a subjective term.