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An automotive vacuum hose is a key component in a car engine that utilizes the vacuum created by the engine to control various automotive systems. In this article, we’ll take a closer look at the question, “Where are the automotive vacuum lines?

Part 1: The Role and Importance of Vacuum Hoses

The location of the car’s vacuum pipe is usually under the hood and connected to the intake manifold. In some cars, vacuum tubes are also connected to the braking system and other auxiliary systems to ensure that the car can operate properly.

Part 2: Common Locations of Car Vacuum Hoses

Cars vary in design, and the exact location of vacuum lines may vary depending on the model and manufacturer. They are usually located in the engine compartment and inside the body of the vehicle.

Vacuum hoses in the engine compartment mainly connect to the engine, transmission, braking system, and other components. Vacuum lines inside the body mainly connect to the air conditioning system, power steering system, and other components.

Engine compartment:
The most common place for a vacuum hose is in the engine compartment. It is usually attached to the intake manifold or throttle body. Look for a black rubber hose about ½ inch in diameter. The hose is usually flexible and may have a ribbed texture.

Near the brake booster:
Another common location for vacuum hoses is near the brake booster. A brake booster is a component that utilizes vacuum pressure to assist in braking. A vacuum hose connects the intake manifold to the brake booster.

Around the air filter housing:
Check around the air filter housing or air intake system. The vacuum hose may be connected to the air filter or intake tube.

Firewall area:
Sometimes the vacuum hose passes through the firewall and connects components in the engine compartment to components in the cabin. Look for a rubber hose that passes through a grommet in the firewall.

Underneath the vehicle:
In some cases, especially in older vehicles, you may find vacuum hoses underneath the vehicle. Follow the hose along the engine compartment and trace its path.

where is the vacuum hose on a car

Part 3: Troubleshooting and inspection methods for vacuum hose

Visual inspection

The vacuum hose can be visually inspected for ruptures, loose or dislodged fittings, and so on.

Touching by hand

You can touch the vacuum hose by hand to see if there is any abnormal situation such as heating or hardening.

Test with vacuum meter

You can use the vacuum meter to test whether the vacuum tube has gas leakage.
If the vacuum tube is found to be faulty, it needs to be replaced or repaired in time.

Part 4: Replacement of auto vacuum tube

The replacement of vacuum tube needs to pay attention to the following points:
Choose a suitable vacuum tube.
The specification and length of the vacuum hose need to be consistent with the original vehicle.
Connect the vacuum hose correctly.
The joints of the vacuum hose need to be firmly connected to avoid air leakage.


Silicone vacuum hoses are an important part of engine operation, affecting various systems such as the braking system and emissions control. If you are unable to locate a vacuum hose or suspect a problem, it is recommended that you consult a professional mechanic or refer to your vehicle’s service manual for guidance on your specific make and model.