This page applies to Just Cause (1) and Just Cause 2. For other vehicles, see: Vehicles - disambiguation. This test was done just outside Kota Pantai Kuala in one of the western arms of the Sungai Sejuk river. You can actually see a small part of the city to the right. Also notice the PBC Tower and the minimap location in the upper left corner.
Amphibious vehicles (Wikipedia article) are land vehicles that can also travel in water (or at least float). This can mean it is possible for the car to be removed from the water using either Rico himself, his Grappler, or another vehicle. Submerged vehicles will appear and work normally when taken out of the water.
All other land vehicles explode or become unrecoverable when in water.
Floats, but can't move. The wheels are about 50-60% underwater. Real monster trucks float the same way, but they can be driven, because the large tire threads will enable the vehicle slowly drive.
Floats, but can't move. Rico will automatically exit the car when it's in water. The water line is at the approximate height of the mirrors and the top edge of the cargo compartment.
Floats, but only moves using momentum gained from land acceleration. If it's blown up while in the water, the wheels fly off, but the wreck will still float.
Floats, but can't move. Oddly, the front end will be deeper in the water than the rear end, even though the engine is in the rear. Rico will lose his oxygen when in the bus. Once he exits, he won't be able to get back in, but the stunt position will still work.
Partially floats, meaning that Rico can dive underneath the vehicle to use it as cover. Stunt position does not work. Some of the suitcases on the roof of the vehicle are protected from the water because of this.
Some mods make some vehicles amphibious. So far there's no mod that allows powered movement in water, but it can be very helpful if ones vehicle can cross rivers by floating accross after gaining speed on dry land.