First of all, we have to figure out the location of the car's exhaust holes. They are generally distributed in the following places, such as the sunroof, the engine compartment, under the door panel, under the spare tire of the trunk, and inside the fuel tank cover. The most easily blocked places are the sunroof and In the engine compartment, because these two places are most easily overlooked.
1. Drain hole of fuel tank cap
I believe that many car owners should not take care of the fuel tank cover except when opening it when refueling, and this is the most clogged place.
2. Drainage hole under the door panel
At present, most of the drainage holes under the car door panels are not drained by hoses. Due to the low position of the car exhaust holes, they are blocked by silt due to long-term driving on muddy roads.
3. Drain hole of trunk
It is located below the car's spare tire storage area. Due to its low location, it will easily penetrate into the car during the wading process. Most manufacturers will use soft plastic to block it, and just poke it when the water is released.
4. Skylight drainage hole
If you do not have the habit of opening the skylight for a long time, the chance of the drainage hole being blocked is not great, but there is one place to pay attention to that the interior panel is damp due to water seepage in the rubber gap.
5. Engine room drainage hole
The air inlet of the air conditioner located under the windshield is the most easily blocked. Because it is very close to the air inlet of the air conditioner, bacteria can easily breed in the stuffy cabin.