How to Replace a Radiator Hose | YourMechanic Advice

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 3: 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. (6.35mm) 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 3: 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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Jose

8 years of experience
33 reviews
Jose
8 years of experience
BMW 325i - Brake Pads Replacement (Front) - Redwood City, California
I had a few mechanics from YM and _all_ of them arrived late (some even 2 hours late) , but not Jose! He arrived right on time! I gave him the keys and let him do his job. I am a curious person so I asked him a few questions about his techniques and he had no problem answering them all with detailed explanations! He did run into a problem on my car because of stripped bolts, but he literally went above and beyond and found a way to remove it. Best mechanic ever.
Lexus CT200h - Brake Pads Replacement (Front) - South San Francisco, California
Jose was on time and did a great job on my brakes. He was friendly and explained the entire process. Would highly recommend.

Augustine

11 years of experience
35 reviews
Augustine
11 years of experience
Chevrolet Equinox - Brake Pads Replacement (Front) - Rio Rancho, New Mexico
Augustine was amazing. He was the perfect example of customer service all around. While he was working, I was recommending him to my neighbors. Next time I need work, I will be requesting Augustine specifically!!!!! Please give him a raise or bonus!!!
Toyota Corolla - Brake Pads Replacement (Front) - Albuquerque, New Mexico
Mr. Sanchez showed up on time and finished replacing my rotors and break pads. He was very informative and treats your car like his own. He was very time efficient and communicated very well. I highly recommend Mr. Sanchez’s services!!!!

John

26 years of experience
552 reviews
John
26 years of experience
GMC Yukon XL 1500 - Brake Pads Replacement (Rear) - League City, Texas
I am so happy John is back. I trust him very much. He is efficient and has a tremendous amount of mechanical knowledge. He is a true asset to Your Mechanic.
Ford F-150 - Brake Pads Replacement (Front, Rear) - Alvin, Texas
I like John because he is very knowledgeable about all my vehicles. In addition he is very organized regarding how he performs his work.

Wesley

8 years of experience
45 reviews
Wesley
8 years of experience
Dodge Nitro - Brake Pads Replacement (Front) - Peoria, Arizona
Great experience. Very professional, friendly, and knowledgeable. Highly recommended and will continue to use for future work.

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