The upper radiator hose is an essential component in your vehicle engine. It is a flexible rubber hose which starts to degrade when exposed to high temperatures and pressure. As a result, you have to face various issues such as engine overheating.
To overcome these problems, you need to replace the damaged radiator hose immediately. In this guide, we will tell you how you can install an upper radiator hose in your car. You will also learn about the expense that you have to pay for its replacement.
Steps of Upper Radiator Hose Replacement & Installation
If your car radiator hose is too old or breaks during your drive, you do not need to be worried. Because the replacement of the upper radiator hose is a very simple process which you can do by yourself easily. It takes just 30 to 45 minutes and you can install a new hose. As a result, you remain safe from costly repair shop labor.
1. Tools and Parts You Need
To change the upper radiator hose, you do not require expensive tools. In fact, most of the basic equipment you may have already. You can gather the following tools for this project.
- New upper radiator hose
- Hose clamp pliers or a screwdriver
- Fresh coolant
- Safety gloves and glasses
- Fluid catch pan or bucket
- Utility knife or razor blade (optional)
- WD-40 or clean water (optional)
2. Cool the Engine
You have to park your car on the plane surface. Then turn off the vehicle and allow the engine of the vehicle to cool down. For this process, you need to wait for a few hours. Do not try to open the hood immediately after stopping the vehicle. Because pressurized hot coolant and steam can injure you.
Before starting the work, make sure your vehicle’s engine is completely cool. Then, open the bonnet of the car smoothly without any hurry.
3. Find Upper Radiator Hose
Where is the upper radiator hose located? It is found at the top of the engine bay and connects the upper side of the radiator to the engine’s thermostat housing. You can see it easily on the top front of the radiator when opening the bonnet. In fact, it is one of the thickest rubber hose under the hood.
That’s why you can identify it from all other coolant flow lines. But the lower radiator hose is located at the bottom of the radiator which is difficult to reach.
4. Drain Coolant
After finding the top radiator hose, you have to place the drain pan under the radiator. Then open the radiator petcock (drain valve) to lower the level of coolant below the upper hose. If your car radiator does not have a petcock, open the lower connection to drop the fluid level.
How to replace upper radiator hose without draining? You can change the upper radiator hose without draining the coolant completely. But it can cause some coolant to spill when you open the hose. So, it is better for you to lower the level of fluid below the hose.
5. Remove Old Hose
Now we advise you to slide the hose clamps away from the radiator and engine connections. For this process, you can use pliers or screwdrivers according to clamp type. After this, twist the hose so that its rubber seal breaks. Pull the hose off, but keep its open side up to prevent leak of remaining coolant.
If your radiator hose is stuck and does not remove from the connections, you can use a knife to cut it. You can also slice it off with the help of a razor blade. But take care there is no damage to the inlet and outlet nozzle.
6. Prepare and Install New Hose
You can use a clean rag to remove debris and corrosion from nozzles of radiator and engine after removing the hose. If you want the hose to slide smoothly, you can spray a tiny amount of WD-40 or dish soap on the metal fittings. Before installing the new hose, you have to slide clamps onto both ends of the hose.
Then, push the radiator hose on the engine water neck and the radiator inlet firmly. Make sure it goes at least 1.5 inches over the fitting. You should tighten the clamps just next to the raised bead of the fitting. But do not overtight them.
7. Refill Cooling System with Fresh Coolant
After replacing the damaged top radiator hose, close the radiator drain plug securely. Then you need to fill the radiator with coolant again. For this process, you can open the radiator cap and fill it at a specific level by using a funnel.
To get excellent performance of your car, you must use the coolant type that is recommended by the manufacturer. You must top up the overflow reservoir at the proper line also. Do not fill it over its mark.
8. Bleed/Remove Air From Cooling System
To remove air which is trapped in the cooling system, you need to leave the radiator cap off. Turn your heater on high and start the engine. After this, you have to allow the engine to reach its operating temperature. As air escapes, you note that the level of coolant decreases.
You should top up the coolant until the system is filled properly. Then close the radiator cap. You can also use the manufacturer’s bleeding method for it.
9. Check For Leaks
At the end, you can take a drive to check the working of the upper radiator hose. If coolant leaks, there is a chance of loose clamps fitting. You must tighten them again. You can see your dashboard temperature gauge. It will show the engine overheat sign when coolant level drops. You can also determine the level of coolant after a few days. If you find it low, fill the coolant as needed.
Upper Radiator Hose Replacement Cost
Basically, replacement cost of upper radiator hose depends on if you change it yourself or hire a professional mechanic. It also varies by vehicle, location, full coolant flush and component change.
| Service Type | Part Cost | Labor Cost | Total Estimated Price |
| DIY (Do It Yourself) Replacement | $15 – $60 | $0 (your time) | $15 – $16 |
| Professional Repair Shop | $15 to $60 | $45 – $140 (30 to 60 mins) | $60 to $200 |
| Dealership/High End Shop | $30 – $80 | $90 to $250 | $120 – $330 |
Top Radiator Hose Installation Problems and Solutions
In case of replacing the upper radiator hose, you can face some complications. But they are minor problems that you can handle easily.
- Sometimes, fluid starts to leak at connections due to loose or misplaced hose clamps. You should position the hose behind the barb and fix them tightly on the fitting.
- You can face engine overheating problems. This is due to trapped air in the cooling system that reduces fluid flow. You must bleed the cooling system to escape this air.
- The old radiator hoses can stick or fuse tightly to the metal radiator and thermostat housing inlet. To overcome this issue, you have to twist the hose side to side gently. It helps you to break the seal.
- If you use a universal hose or install it in the wrong way, it can rub against a hot engine belt and sharp bend will restrict the flow. You can buy a hose which is specific for your car. Also, make sure there is no kink or bend.
Final Advice
If you are tired of repairing your car radiator hose frequently, you should replace it with a new one. For getting a high quality top radiator hose, we can help you.
RONTEIX is a professional radiator hose manufacturer in China. We always have a fresh stock of upper radiator hose and lower radiator hose in our factory. Our team also offers customization services so you can share your requirement with us. You can order directly from our website or send your inquiry today.
People Also Ask
Why is my upper radiator hose flat?
Your upper radiator hose can collapse due to several reasons. A faulty radiator cap does not allow coolant to return from the overflow reservoir. It causes the hose to flatten. Plus, a vacuum forms in the cooling system when the engine cools. It also pulls the hose inward.
What does the upper radiator hose do?
It carries hot coolant from the engine to the radiator. Actually, coolant absorbs the heat from your vehicle’s engine. Then it flows through the upper hose to the radiator, where heat is released to the air.
Should top radiator hose have pressure?
Yes, the top radiator hose has pressure when your car reaches normal operating temperature. At that point, the coolant starts to expand but the radiator cap controls this expansion. As a result, approx. 12 to 15+ psi of pressure builds up. It makes your car’s top radiator hose firm and hot.
What would cause upper radiator hose to burst?
Upper radiator hose can rupture due to the excessive cooling system pressure, overheating, contamination and physical damage. These factors cause the hose to weaken. As a result, it can not handle the heat safely and bursts.
What does the upper radiator hose connect to?
Basically, the upper radiator hose connects the top of the radiator to the engine’s thermostat housing. Its one side is attached to the inlet of the radiator by hose clamps. While the other end connects to the thermostat housing or water outlet on the engine.
