Checking the "engine room", which becomes even more difficult. The engine room has a better "water drainage" than a highly airtight car, and the whole will dry in a short time even if it is submerged. Therefore, unlike in a car that is kept in a high-humidity state for a long time, the occurrence of mold (the cause of stains and smells) and the occurrence of rust (the cause of failures and defects) will be suppressed.
At the time of flooding, the mud “film” covers each part as if it were “coating” (image ①), but these can also be easily removed by washing.
For these reasons, it is difficult to find a "flooded trace" more than in a car. However, if you take the time and effort, it is natural that you can restore well. Not all vehicles that have been submerged will be repaired with the same quality. Although not as much as in a car, if you want to check its traces, the keyword "mud dirt" that is fine at this fine-grain level will be the keyword.
The engine room is well drained, so it can be washed at once with a high pressure washer. However, since it is only the "surface", mud remains in small parts, especially in the "inside of the parts". For example, even if the fuse box has a clean surface, opening the lid will reveal mud buildup and condensation as shown in image ②. Even with highly airtight headlamp units, muddy water may enter due to deterioration of the packing. If it is not completely dry, severe condensation (image ③) will occur, and even if it is dry, mud may remain near the bottom of the unit. Dew condensation alone is not a decisive factor in flood damage, but it is even more likely when mud accumulates.
Find the year label. If the headlights have been replaced, the traces of mud will disappear, but there are other ways to check. It is to look for "Label with manufacturing year". As introduced in the previous issue, recently sold vehicles (especially overseas manufacturers) can now be labeled with the year of manufacture of the parts at various places (image ④). Headlight units are one of them. There are many other types of wiring, radiators, sensor units, and their targets (Image I). Even if it is clear that parts have been replaced, it is not a decisive factor for flood damage, but this is also a point that can be used as a reference when making a comprehensive judgment