Is the car chassis waterproof?

[LukasDella]

Car chassis are not waterproof. Below is relevant information about car driving licenses: C1 driver's license: C1 is the highest level in driver's licenses, allowing the operation of small and micro passenger vehicles, light, small, and micro cargo vehicles, as well as small and micro special operation vehicles. Additionally, it permits driving all vehicle types covered by C2, C3, C4, and C5 driver's licenses. C2 driver's license: C2 is the designation for small automatic transmission vehicles, allowing the operation of small and micro automatic transmission passenger vehicles, as well as light and micro automatic transmission cargo vehicles; light and micro special operation vehicles.

[Geraldine]

During the last maintenance, the technician showed me the undercarriage, and I realized that the original metal parts already had rust-proof treatment with sealing strips at the joints. However, there are actually heat dissipation holes under the engine guard plate, so water can still seep through when driving through deep water. During heavy rain, I'm most afraid of water exceeding half the tire height, as the transmission vent might take in water. Now, after washing the car, I always check if there's any water accumulation sound under the chassis, especially under the rear seats—the lowest point of the undercarriage. Before heading out in the rainy season, I spray a layer of undercoating adhesive (30 yuan per can on Taobao, quite effective) an hour in advance.

[AlejandroFitz]

Off-road enthusiasts all understand the importance of chassis waterproofing. I remember once when modifying and lifting the suspension, I noticed the factory battery box and transmission underside were only protected by a thin mudguard, which would definitely fail when crossing rivers. The professional solution is to use 3mm steel plates to create fully enclosed skid plates, sealing the gaps with automotive sealant. However, it's crucial not to fully enclose the exhaust pipe area, as high temperatures can cause the skid plate to deform. After modification, field tests showed the vehicle could wade through 50cm deep water, though fuel consumption increased by about 0.8 liters.

[MacAllie]

With 15 years of car repair experience, chassis water leakage cases generally fall into three categories: aging seals in older vehicles allowing sewage to seep through sheet metal seams; deformed frames in accident cars leading to seal failure; or unsealed screw holes in aftermarket engine guards. The most overlooked issue is damaged driveshaft dust boots, where sand and water ingress can wear out universal joints. If you notice moldy carpets, promptly lift and inspect—replacing an oil pan gasket costs just around a hundred bucks.

[Salvador]

When I first got the car, I was particularly concerned about the chassis. The salesperson mentioned that new cars nowadays come with PVC coating. Last week, I specifically went to the 4S store to check the chassis of the display car, and it indeed looked like it was covered with a layer of gray-black rubbery substance. The technician demonstrated using a high-pressure water gun to spray the seams of the underbody, and the water droplets would coalesce and roll off. However, they reminded me that rubber bushings can harden and crack after five or six years, so avoid blasting the rubber sleeves of the suspension arms when washing the car. I plan to have an anti-rust treatment for the chassis before winter every year.

[McArianna]

Driving a ride-hailing car in the south is most dreaded during heavy rainstorms. Last year, I was forced to wade through deep water three times. Now, as long as the water doesn't submerge the middle section of the exhaust pipe, I dare to pass through, keeping a steady speed in low gear for the most stability. The key is to inspect immediately after passing: turn on the air conditioning to check for any earthy smell, which indicates water has entered the cabin; feel around the spare tire well for any water stains; and pay special attention to the connection points of the front wheel inner liners. That time when I took them apart, I found a lot of mud stuck there, which could cause the brackets to rust through.