Can You Wash the Car When It's Hot?
2 Answers
You should not wash the car when it's hot for the following reasons: 1. Brake disc deformation: Washing the car at high temperatures, especially after high-speed driving, may cause the brake discs to deform due to the thermal expansion and contraction principle, leading to shaking during braking. 2. Engine block deformation: Washing the car when it's hot can cause the engine block or transmission to contract and deform, or even crack, if cold water comes into contact with them due to thermal expansion and contraction. Additional precautions for car washing: Apart from avoiding washing when the car is hot, you should also avoid spraying water on water-sensitive parts or components such as the intake tract, relays, sensors, and high-voltage wires. Either avoid these areas or take waterproof measures when washing.
I really wouldn't recommend washing your car when it's hot. As someone who loves keeping their car clean, I once made the mistake of washing it right after stopping for convenience's sake. The result? A creaking sound from under the hood, and later, a visit to the mechanic revealed tiny cracks in the exhaust manifold. The mechanic explained that this was caused by the rapid cooling and contraction of the hot engine when it came into contact with cold water. This kind of thermal shock not only damages metal but can also crack glass and warp brake discs due to uneven temperatures, affecting braking performance. Now, I always wait at least 20 minutes for the car to cool down before washing it and avoid doing so under direct sunlight. Avoid using high-pressure water jets directly on hot parts; opt for warm water and gentle rinsing to minimize risks. Also, be careful when washing the wheels, as hot tires can easily damage the sidewalls when wet. Developing good habits to protect your car's lifespan is key, like parking in the shade to help it cool down.
