How to Replace a Radiator Hose

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The radiator hose is an important part of your vehicle’s cooling system. The hose carries the coolant to the radiator, where the fluid is cooled, then back to the engine to keep the vehicle from overheating. This allows your vehicle to operate at the perfect temperature and provides you with a smooth ride.

There are two hoses that connect to the radiator. The upper hose attaches from the top of the radiator to the top of the engine. The lower hose attaches to the bottom of the radiator to the water pump of the engine.

If the radiator hose of your car fails, it can lead to loss of coolant and subsequent engine overheating. Overheating can lead to further engine damage. If you suspect that either radiator hose is failing, replace the faulty hose as soon as possible.

Part 1 of 2: Remove the leaking radiator hose

Materials Needed

removing radiator cap

Step 1: Remove the radiator cap. Wait until the radiator cap is cool to the touch. Then remove it and set it aside.

  • Warning: Do not remove the radiator cap when it is hot! The system is under pressure and the cap may burst off, burning you with hot coolant.

draining coolant

Step 2: Drain the coolant. Place a clean container below the vehicle, right under the radiator.

radiator petcock

Drain the coolant either by opening the drain petcock or by sliding back the clamp on the lower radiator hose (see the following step for the hose removal procedure).

loosening hose clamps with a pair of pliers

Step 2: Loosen the hose clamps. Loosen the clamps at each end of the hose. The hose clamps are typically either of the spring tension or screw tension design.

To remove a spring tension clamp, squeeze it with pliers and pull it back on the hose, away from the connection. To remove a screw tension clamp, simply loosen the clamp with a screwdriver, then pull it back on the hose, away from the connection.

removing a radiator hose

Step 4: Remove the radiator hose. Once you have the clamp off, you can remove the radiator hose by twisting and pulling it off the fitting.

  • Tip: If the hose is stuck on the connection, slit it with a razor blade. Do not cut so deep that you damage the connection. After being cut, the hose can be peeled back and discarded.

Part 2 of 2: Install the hose

Step 1: Slide clamps over the replacement hose. Slide the hose clamps over the replacement radiator hose but do not tighten them down.

installing the radiator hose remove text

Step 2: Install the radiator hose. Slide the hose onto the connector.

Then, position and secure the clamps at least 1/4 in. (6.25mm) from the ends of the hose. Check to ensure the clamps are located beyond the raised bead of the connector and then tighten them down.

filling radiator

Step 2: Refill the radiator. Close the drain petcock or reinstall the lower radiator hose. Then fill the cooling system with a 50/50 mixture of coolant and distilled water.

  • Tip: The easiest way to ensure you are getting the proper radiator fluid mixture is to buy pre-mixed radiator fluid.

  • Note: Some methods for bleeding the cooling system require filling the system during the bleeding process.

bleeding air from the system

Step 4: Bleed the cooling system. Whenever you service the cooling system, you must bleed it to remove air, otherwise overheating may result.

There are a few different methods for bleeding the cooling system:

different ways to bleed the cooling system

Step 5: Top off the coolant. Top off the coolant in the radiator and reservoir. Then, reinstall the radiator cap. Run the engine and check for leaks.

It is a good idea to replace the hoses every 5 years or for every 40,000 miles. If you see coolant (red, yellow or green fluid) on your driveway, get the car inspected for leaks immediately. Driving with leaking radiator hoses can cause severe damage to the engine.

It is important to replace worn or leaking hoses to prevent future failure of these hoses where they may burst, causing engine overheating. Since replacing a radiator hose on your own can be messy, you may want to request a professional mechanic, such as one from YourMechanic, to do it for you.


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Arturo

25 years of experience
42 reviews
Arturo
25 years of experience
Volkswagen Tiguan - Brake Pads Replacement (Rear) - La Jolla, California
Arturo was efficient and extremely professional. I'll refer him to friends and family and call him for any issues related to my car. I am very happy with the service!
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

Travis

11 years of experience
312 reviews
Travis
11 years of experience
Ford Explorer Sport Trac - Brake Pads Replacement (Rear) - Minneapolis, Minnesota
Travis is great! This is the second time he has come and serviced our truck. I recommend Travis for any service ned you may have!
Subaru Forester - Brake Pads Replacement (Front, Rear) - Rosemount, Minnesota
Thank you Travis for your fast, easy, honest work on my vehicle today!! The first thing you did upon arrival to my home was find me a discount coupon for $50 off my service estimate. You did only what needed to be done in record time. You not only saved me lots of money, but did things in a profession manner. I've been looking for an honest auto mechanic for my whole life and would love for you to be it!! Thank you, thank you, thank you!! You're the best!!!

Scott

32 years of experience
346 reviews
Scott
32 years of experience
Hyundai Sonata - Brake Pads Replacement (Front, Rear) - Denver, Colorado
Arrived on time and worked quickly. Gave me detailed information on his completed work and the details of my car. Answered all of my questions thoroughly.
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!

Nicholas

9 years of experience
251 reviews
Nicholas
9 years of experience
Lexus GX470 - Brake Pads Replacement (Rear) - Clayton, North Carolina
Nicholas texted me 30 minutes prior to arrival. Showed up on time as scheduled. He confirmed the work that I requested be performed. He completed the work, performed the road tested, and delivered my keys along with recommendations of other work that might be in my best interest. Was very pleasant, professional, and cleaned up after he was done. I was so impressed with the service he performed and the speed at which the services were completed. I have already scheduled a future service with Nicholas and will schedule any and all future repairs with him if he is available.

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