What Must Be Replaced in a Flooded Car?
3 Answers
Flood-damaged vehicles require the following replacements: Engine: Do not attempt to start or turn over the engine. Tow it to a repair shop immediately for disassembly and cleaning. Engine treatment involves removing all spark plugs and conducting a cylinder compression test, typically ranging between 900kPa to 1100kPa for gasoline engines. Transmission: After disassembly, clean internal oil passages, valve bodies, friction plates, and torque converters. It's best to send the transmission to a professional automatic transmission repair facility for cleaning, inspection, and repair. Replace transmission fluid, friction plates, check valves, and transmission repair kits. Wiring Harnesses: For vehicles submerged for several days, it's advisable to replace all wiring harnesses entirely, including those for electric motors, audio systems, AC control panels, ABS modules, and other electronic component wiring harnesses.
The most troublesome part of repairing a flood-damaged car is the vehicle's electronic components, which are basically rendered useless when exposed to water. Core parts like the ECU (engine control unit), ABS control module, and various sensors must all be replaced entirely; otherwise, the car could break down unexpectedly later. The carpets and seat cushions must also be replaced, as waterlogged foam harbors mold and will emit odors even after drying. The engine and transmission require professional disassembly and cleaning, but if the water level exceeded the dashboard, it's better to replace the entire engine assembly for peace of mind. Safety is no small matter—never compromise on the braking system or airbag modules.
Last time I dealt with my flood-damaged car, the repair list was shockingly long. The replacements required included the entire wiring harness because impurities in the water could corrode the connectors. The air conditioning system was particularly hard hit, with the evaporator and blower filled with muddy water mixture - not replacing them would leave a musty smell all year. I remember even the fuel pump and filter in the gas tank had to be completely replaced, as water-contaminated gasoline could damage the fuel injectors. Many people overlook the seatbelt pretensioners under the seats - if not replaced, they might fail in emergencies.
