How to Replace a Vacuum Hose

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Vacuum hoses run throughout an engine’s compartment, and they are used for many applications in the engine and inside of the vehicle. Vacuum hoses supply vacuum to different sensors and actuators. These sensors help in monitoring how your vehicle is running and gives any input needed to your vehicles PCM (Powertrain Control Module). The PCM is your vehicle's brain, often referred to as your vehicle's computer.

The vacuum hoses tend to get dry and brittle when failing, depending on the environment they are in such as in dry and hot weather hoses in general deteriorate quicker. In some cases they are damaged by chafing or rubbing that causes a vacuum hose to leak.

A good way to check your vacuum hoses would be to look for physical damage. A brittle hose will crackle, break, split, and rubber also deteriorates and blacken your hands after touching. Common signs of a failing vacuum hose include the Check Engine Light illuminating, the engine not running smoothly, and the engine losing power or not starting.

Part 1 of 1: Installing the new vacuum hose

Materials Needed

Step 1: Raise and secure hood. Raise and secure the hood to your vehicle.

engine cover

Step 2: Locate the vacuum hose. Depending on your vehicle you may need to remove a engine cover.

The engine cover’s main purpose is cosmetic. They are usually bolted down or easily pull right out by lifting straight up.

removing the hose clamps on the vacuum hose

Step 2: Removing the hose clamps. There are a variety of clamps used in vehicles.

Gear type clamps loosen and tighten by a screw type mechanism, spring clamps loosen by compressing clamps with pliers, and some vacuum hoses have quick disconnects that require releasing the vacuum hose by pushing a tab on the fitting. Some vacuum hoses won't have clamps and seal by the constriction of the vacuum hose.

removing the vacuum hose

Step 4: Removing the vacuum hose. Once the clamps are removed, a vacuum hose is fairly easy to remove.

Grab the end that was clamped and twist it. This will break it loose, and the hose should turn side to side freely. While turning it side to side, pull on the hose while holding the opposite end and remove the vacuum hose. If you are still have a hard time removing the vacuum hose, you need to split that end of the hose with a utility knife.

routing of some vacuum hose system

Step 5: Routing the vacuum hose. When installing the vacuum hose you may need to route the hose correctly.

If the hose was secured underneath other hoses or clamped down in a specific location, it is very important to install it the way you found it. If you don't, you may chance it rubbing or being smashed by moving parts or against other hoses.

vacuum lines installed and tightened

Step 6: Put hose onto fitting. Before putting the hose onto its fitting, spray a little penetrating oil on the inner end of the hose to be installed.

This makes installation much easier.

Step 7: Clamping the vacuum hose. Install the correct vacuum hose clamps and tighten.

Do not over-tighten the hose clamp as you might pinch the hose and cause another vacuum leak.

Step 8: Verify the repair. Take another look at the repaired vacuum hose and be sure everything is in place.

Step 9: Install the engine cover. It either pops back into the retainers or you must secure it with bolts and nuts depending on your vehicle.

Vacuum hoses are very important as they allow your vehicle to run properly and, in some vehicles, there are vacuum operated actuators that control your vehicle's air conditioning and heating air distribution controls. If you have any questions about the process, be sure to Ask a Mechanic for some quick, helpful advice.


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Rigoberto

9 years of experience
706 reviews
Rigoberto
9 years of experience
Chevrolet Equinox - Brake Pads Replacement (Rear) - Niles, Illinois
Rigo was great! He got there early, finished the job early, left everything clean. He changed my rear pads and rotors. The original quoted time was 90 minutes, he was done in about 60. He knows what he is doing and I am recommending him to all my friends and coworkers.
Mercedes-Benz C250 - Brake Pads Replacement (Front, Rear) - Chicago, Illinois
Rigo is a maverick hands down. Don’t take your car for work elsewhere. Especially great at Mercedes—this guy knows his profession! I will be using him for everything related to my car going forward.

Arturo

25 years of experience
35 reviews
Arturo
25 years of experience
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto
Nissan Maxima - Brake Pads Replacement (Front, Rear) - San Diego, California
Arturo was prompt and completed my brake repair, including new rotors in a very efficient manner. I am very pleased with the quality of the work and the parts and will definitely look to have him service our other car in the near future.

Scott

32 years of experience
345 reviews
Scott
32 years of experience
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Michael

10 years of experience
15 reviews
Michael
10 years of experience
Nissan Sentra - Brake Pads Replacement (Front) - Conyers, Georgia
He was promptly on time and got the job done efficiently in a timely manner. I really appreciate the rapid respone on getting the job done! I would most definitely use this service again.

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