Sometimes you start your car in winter season and turn on the heater, but air stays cold. In this scenario, you check under the hood and find a cracked heater hose leaking coolant. This is a common sign that your vehicle heater hose needs replacement.
That’s why we wrote this article to guide you about the right method of heater hose replacement. We will explain everything like removal of old hoses, installation of new hose plus mistakes you should avoid during this process.
How To Replace Heater Hose in 9 Steps?
Before you start a heater hose replacement, we suggest you get all the tools in advance. This will make the job easier, so you can remove and install the conduit safely. Below I have listed all required equipment. Once you have gathered them, then you can follow the detailed process of heater hose replacement.
- Safety gloves
- Flat-head screwdriver
- Hose clamp pliers
- Hose pick or pick tool
- Heater hose removal tool
- Drain pan/coolant drain bucket
- Funnel
- Coolant
- New heater hoses
- New hose clamps
- Suitable caps or plugs for the hose openings
1. Park Your Vehicle & Let Engine Cool Down
The first thing you need to do is park your car on a flat surface and turn off the engine. At this stage, you should not touch anything and allow the engine to cool down. Because hot liquid can cause serious burns if you try to open the cooling system.
Our advice is to open your car hood and wait at least 45 minutes. For maximum protection, you should hold off around 2 to 4 hours after driving. Never forget to set the parking brake before you start the repair.
2. Locate Heater Hoses
In most standard passenger vehicles, you can find the heater hoses in the engine bay near the firewall. Well, you need to locate both hoses and must note where they connect. You can also take a photo of their routing, so you can install the new hose correctly. After you observe heater hoses, you should carefully inspect their condition between the water pump and heater core.
Also look for white or crusty coolant deposits. These signs basically signal a slow leak. It’s also important to check the points where the rubber hose connects to metal fittings. Because, leaks can also develop around these connections.
3. Remove Hose Clamps
- Now it’s time to use a flathead screwdriver to loosen the hose clamp near the throttle body.
- Then, you should release the other clamp and disconnect the tubes.
- You can also remove the snorkel to create more working space.
- At this point, you need to push down the tabs on the connectors and slide them off.
Note: Some vehicles use quick-connect fittings instead of traditional clamps. In this case, you can release the locking tabs or clips according to the vehicle’s design. Never force the fitting because it can damage the heater core connection.
4. Cut Heater Hose (Hose Repair)
Suppose you notice that the heater conduit leaks at the connection to the water pump or heater core. In this case, you can fix it without the use of a coupling. You need to cut off the damaged end of the hose and then push the good part back onto the fitting.
Thereafter, you should secure the hose with a pipe clamp. But if the leak is in the middle of the hose, you must cut out the damaged section and use a coupling to join the two good ends together.
Do Not Ignore: If only a small section of heater hose is damaged and the rest of the hose looks strong, then you can follow this step. But if the hose shows signs of overall wear or serious damage, you can skip the repair step and move to removal of the hose.
5. Remove Heater Hose
Engine side connection: You must place a drain pan under the vehicle before you remove the hoses. This is because some coolant will drain out during the replacement. It’s best to use hose clamp pliers to move the clamps away from the hose connections. Then, you can twist the hoses back and forth to loosen them.
In case the hoses feel stuck, I suggest you use a pick to carefully work around the tube connection. Once the hoses loosen, you can pull them off and let the coolant drain into the pan. Mechanics also prefer suitable caps to cover the openings.
Rear connection point: You can use a flat-head screwdriver to carefully release the retaining clip at the back. Once you open the clip, you can pull the hoses away from the connection.
Heater core connections: To remove the hoses from the heater core, you should use a special hose removal tool. You can slide it over the heater core hose and push it into the fitting. This will spread the small locking fingers inside the fitting. Once the fingers release the hose, you can pull the hose off. Now you can remove the tool and repeat the same process for the other heater hose.
6. Clean Hose Fittings
It’s also important to clean the fittings with a clean rag. You must remove old coolant, dirt, or pieces of rubber. Plus, you need to check the fittings for cracks or other damage before you install the new hose. With a clean and smooth fitting, you can seal the hose properly.
7. Compare Old & New Hose
Now you should place the old and new hoses side by side. Then, you must make sure that they have the same length, shape, diameter, bends and connection points. Also compare the routing before installation.
8. Install New Heater Hose
You need to position the hose directly in front of the fitting. Then push it into place until it locks. You can install the second hose in the same way. Always place the hoses correctly in the mounting bracket and secure them in place.
Our suggestion is to reuse the old hose clamps if they still look good. However, you can replace them in case they are damaged. You need to carefully slide the new clamps over the hoses. Now you should remove any caps from the connections and push the hoses fully into place.
At this point, position the clamps correctly and tighten them with a screwdriver. Finally, you can put the snorkel back into position and tighten the hose clamps on both ends. Never forget to reconnect small hoses and lock the connectors back into place.
9. Inspect For Coolant Leak
Finally, it’s time to remove the coolant reservoir cap to refill coolant in your car. You can use a funnel to add the correct coolant. In most cases, a 50/50 coolant and water mixture works for many vehicles.
But you should use the coolant type recommended for your vehicle. Always fill the reservoir to the correct level. Now you should start the engine and let it run for around one minute. Then install the reservoir cap. After that, you should run engine for at least 15 minutes and watch the temperature gauge.
You must make sure the engine does not overheat and check for coolant leaks around the new hoses. Last but not least, you can turn the engine off and allow it to cool completely. We recommend that you check the coolant level again and add more coolant if needed.
Why Do You Need To Replace Heater Hoses?
Heater hoses have an important role in your car’s cooling and heating system. But over time, heat, pressure or coolant can wear them out. In this case, you need to replace your car heater hoses to prevent leaks. This will keep your vehicle running safely. Below are major reasons why you should change heater tubes.
- Age and normal wear
- High engine temperatures
- Constant coolant exposure
- High cooling system pressure
- Rubber material breakdown
- Chemical damage from coolant
- Poor quality or damaged hose material
- Engine vibration and movement
- Incorrect hose installation
- Upgrade to a stronger hose
When Should You Replace Heater Hoses?
Most manufacturers and mechanics highly recommend changing heater hoses every 4 years or 50000 to 75000 miles, though there is no universal mileage rule. However, extreme heat, cold and other harsh conditions can shorten this service life. We also suggest you replace the conduit clamps whenever you replace the hoses because they can wear out over time too.
Author’s Tip: The heater hoses in your car do not always show clear signs that they need replacement. If you notice the hose is soft, swollen, cracked or develops bubbles, it already has serious damage.
How Do You Test a Heater Hose For Leaks?
- You should start with a cold engine and inspect heater tubes for cracks, cuts, swelling, soft spots or dried coolant.
- Also inspect both ends of the pipe where it connects to the engine and heater core.
- Then you need to check for pipe areas that feel too soft, hard, brittle or weak.
- Now you can start the engine and let it reach its normal operating temperature, then look for fresh coolant around the hose and connections.
- You must check the coolant level in the reservoir and look for an unexplained drop, which can point to a leak.
- Our suggestion is to use a cooling system pressure tester in case you cannot find the leak visually.
Mistakes You Should Avoid During Heater Hose Replacement
Most mechanics and car owners take heater hose replacement as a simple repair task. But small mistakes can cause coolant leaks or damage other parts. We think you should avoid these common mistakes to make replacement safe and more reliable.
- Work on a hot engine
- Use wrong heater hose
- Install conduit incorrectly
- Reuse damaged clamps
- Overtighten hose clamps
- Undertighten tube clamps
- Cut tube fitting
- Forget to drain coolant
- Use wrong coolant
- Leave air in cooling system
- Fail to check for leaks
- Route pipe near hot or moving parts
Heater Hose Replacement Cost
How much does it cost to replace a heater hose? A complete heater core tube replacement generally costs you $500 to $1300 (including parts and labor). This is the estimated range for most common vehicles such as trucks, Ford, Chevrolet, Toyota, Honda, Nissan and Dodge. On average, independent shops charge around $60 to $120 per hour.
| Cost Category | High Cost Option | Average Option | Low Cost Option |
| Heater core tube | 130 to 200 US dollars | $80 to $130 | 40 to 80 US dollars |
| Repair shop labor | $700 to $1100 | 400 to 700 US dollars | $200 to $400 |
| Coolant, gaskets and clamps | $80 – $150 | $50 to $100 | $25 – $60 |
Final Words
Are you worried about finding affordable coolant hoses and hose clamps for your vehicle? Or are you a mechanic, garage owner or parts buyer who need heater hoses in bulk? If yes, then we can help you. Our company RONTEIX is located in China.
We offer heater hoses & clamps in different sizes, colors and shapes. In case a standard hose does not fit properly, we can make custom silicone heater hoses according to your exact requirements. You can send your inquiry any time!
Commonly Asked Questions
Can you repair a heater hose?
Yes, you can repair a heater hose with a splice connector only if the damage is small and limited to one area.
Can you drive with a broken heater hose?
Driving with a broken heater hose is not safe. Because it can quickly cause coolant loss and lead to serious engine overheating.
When to call a professional for heater hose replacement?
You should contact a professional mechanic if the heater hose has severe damage and continues to leak. Moreover, you can consider this option if you do not have the right tools or enough space to safely reach the engine connections
Do You need to replace both heater hoses at the same time?
You do not always need to replace both heater hoses at the same time. However, if one hose fails because of age or wear, then mechanics strongly recommend to change both hoses.
How long does it take to replace a heater hose?
You can mostly complete the heater hose replacement within 1 to 3 hours. In some cases, it can take 2 to 6 hours. Basically, the repair time depends on the vehicle and hose location.
What happens if you don’t replace a damaged heater hose?
If you do not change a damaged heater hose, it can cause a major coolant leak. This can make the engine overheat as well as lead to serious engine damage.
