Even a used car is an investment, and you don't want to buy a damaged car that will cost you tons of money in the long run. If after your own inspection you still aren't sure the car is completely dry, hire an expert.
A good mechanic will know where to look for signs of flood damage. That's especially true of places you may not know how to examine, such as the alternator, certain wiring mechanisms and pumps.
The mechanic should also take the wheels off and inspect the brakes and wheel components, which can carry tell-tale remnants of a flood history, such as silt and mud.
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