Skip the auto shop - Our mechanics make house calls

Q: What are the three hoses coming from air box on my Buick verano?

asked by on

My Buick verano has three hoses coming from the air box. One is a vacuum line, I believe one goes to the pcv valve, and the 3rd goes back to the firewall. When that 3rd hose is removed...it is sucking air from what appears to be the firewall. What is this?

My car has 90000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. There are several vacuum lines associated with the engine intake and throttle. One of which that does run along up towards the firewall is the brake booster line. This vacuum helps assist the master cylinder in maximizing the brake assisting. The others are for the EVAP canister, the fuel pressure regulator, super charger if equipped, and manifold pressure source. You will find the best sources for diagrams is in repair manuals for the vehicle. You may also want to locate the component on the other side to see what the purpose of this line is. For more diagnostic help, contact our service department to schedule an appointment.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hello. My service traction, trac off, and anti lock lights come on a few times while driving. What could this mean?

Hello. When the vehicle is first started the computer very quickly runs a series of test on various systems of the car. If one of these systems sends back a bad reading the warning lights will come on. As the...

Q: Toyota cynos is sputtering and stalls out.

Hi there. There could be a vacuum leak on the engine or to the brake booster causing the engine to run rough and then rev up and down. If all of the vacuum lines are good with no crack, breaks,...

Q: Reconstruction permit for K&N air intake kit

No it doesn't. There aren't any requirements as far as changing anything on your title when it comes to upgrading your car with a K&N air filter.

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.