What does it mean when you hear water sounds after turning off the car?
1 Answers
Hearing gurgling water sounds after turning off the car is caused by the air conditioning condensate pipe behind the center console, which is a normal phenomenon. The following four situations are considered normal: 1. Cooling sound of the catalytic converter: The normal operating temperature of the catalytic converter is 400-800°C. After turning off the engine, its operation gradually stops, and the temperature decreases, causing the internal metal components to expand and contract, resulting in abnormal noises. 2. Cooling sound of the exhaust pipe: Typically, the exhaust pipe can reach a temperature of over 200°C during cold idle. When the car is under high load or when the mixture burns in the exhaust pipe, the temperature can be even higher. Therefore, the exhaust pipe also expands and contracts, producing abnormal noises, often originating from the front end of the exhaust pipe or the flexible joint. 3. Cooling sound of the turbocharger: Normally, the exhaust gas temperature reaches 600-700°C, accelerating the friction-generated heat from the turbocharger's rapid rotation. After turning off the engine, the heat expansion and contraction are quite noticeable, leading to abnormal noises. 4. Abnormal noises caused by uneven engine cooling: After driving for a while, the engine temperature becomes very high. When turned off, the temperature of various components drops, and the heat expansion and contraction cannot occur uniformly, inevitably causing friction between internal metal components due to cooling contraction, resulting in abnormal noises.
