What is the rubber hose on the engine called?

[VonCorey]

The rubber hose on the engine is called the crankcase forced ventilation tube. The purpose of crankcase forced ventilation is to maintain the pressure balance of the crankcase inside the engine body, preventing damage to sealing parts due to excessive or insufficient pressure. When the engine is idling or operating at low speed and low load, the crankcase is in a state of significant negative pressure. This condition can cause a large amount of engine oil to enter the intake system along with blow-by gases and participate in combustion, leading to oil burning and severely affecting the engine's performance and emissions. Therefore, the crankcase must be forcibly ventilated. When the pressure inside the crankcase increases, the crankcase is ventilated through the exhaust valve or oil-gas separator, keeping the pressure fluctuations within a reasonable range. Inspection method for the forced crankcase ventilation system: Remove the ventilation hose from the forced crankcase ventilation valve, remove the crankcase ventilation valve from the rocker arm cover, reconnect the crankcase ventilation valve to the removed ventilation hose, start the engine, and let it idle. Place a finger over the opening of the crankcase ventilation valve to feel and confirm whether the intake manifold reaches a vacuum (whether the finger is attracted). At this time, the plunger of the crankcase ventilation valve will move back and forth. If no vacuum is felt, clean or replace the crankcase ventilation valve.

[MacOmar]

I often tinker with the engine part of my car. Those rubber hoses are mainly used in the coolant system to transport hot coolant from the engine to the radiator for cooling. They are made of high-temperature-resistant rubber but are prone to cracking and leaking as they age. Last time, the one in my car started leaking, causing the engine to overheat and nearly burn out. I recommend regularly inspecting the hoses for any cracks, swelling, or hardening. If you notice any abnormalities, replace them with new hoses immediately—it only costs around a hundred bucks. During routine maintenance, avoid using high-pressure water jets directly on them to prevent accelerated aging. Don’t underestimate these small parts; if they fail, they can drag down the entire cooling system or even leave your car stranded on the road. I’ve watched some online tutorials, and replacing them yourself isn’t too hard—it saves on repair costs.

[DelNorah]

In my experience with older cars, the rubber hoses on the engine aren't just for coolant lines—they also include vacuum hoses and fuel lines. These hoses endure high temperatures and pressure, becoming brittle and cracked over time. I once encountered a car with aged vacuum hoses that caused unstable idling and reduced power. When replacing hoses, always opt for high-quality OEM parts rather than cheap, inferior substitutes. Before driving, routinely check the hoses for any signs of cracks or leaks, and address any issues promptly. Regular maintenance, including attention to these details, can extend engine life and save you from costly major repairs. Cars with over 100,000 kilometers are especially prone to such problems, so I recommend a thorough inspection every two years as a precaution.

[OKevin]

After years of driving, I've learned that if rubber engine hoses like coolant pipes rupture and leak, it can cause overheating issues. That's exactly what happened to my car last time—it broke down on the road, and the rescue cost me hundreds. Everyone should make it a habit to check hose conditions: feel their firmness and look for cracks or leaks. Replacing a new hose only costs between tens to a hundred yuan—don't delay. Maintaining them properly can prevent sudden breakdowns.

[LeEsther]

While working on my car, I noticed those rubber hoses connecting various parts in the engine, such as the coolant flow and vacuum booster systems. During daily use, gently touch the hoses to check their flexibility – if they feel hard or show cracks, replacement is needed. The preventive method is to avoid shutting off the engine immediately after intense driving; let the hoses cool down naturally. During regular maintenance, having a technician inspect them is simple and efficient.

[DiFernando]

When I first started learning to drive, I couldn't understand the purpose of those black rubber tubes on the engine. Later, I learned they were hoses for transporting coolant and fuel. Made of rubber, they're prone to aging and can crack or leak after prolonged exposure to high temperatures. During one maintenance check, I noticed slight seepage in my car's hoses and replaced them promptly. A friend of mine ended up spending a lot on major repairs due to similar issues. It's important to keep an eye on the temperature gauge while driving and pull over to inspect if anything seems abnormal.