How to fix a hole in aluminum radiator?

Aluminum radiators are often used in high-performance vehicles because of their good heat conductivity properties. Unfortunately, these same properties make them susceptible to damage from impacts. If you have a hole in your aluminum radiator, here are some tips on how to fix it.

You will need a few tools to fix a hole in an aluminum radiator: a drill, a pack of aluminum soft soldering, a can of radiator sealer, and some sandpaper.


1. Drill a hole at the end of the crack, making sure it’s big enough to allow the aluminum soft soldering to fit through.

2. Feed the aluminum soft soldering through the hole until it’s flush with the back of the radiator.

3. Cut off the excess soldering, leaving about 1/8” sticking out.

4. Using a can of radiator sealer, coat the area around the hole and the back of the radiator. This will help to ensure a tight seal.

5. Allow the sealer to dry for about 30 minutes before proceeding.

6. Solder the hole closed, using a propane torch if necessary.

7. Smooth down the solder with a piece of sandpaper.

Will J-B Weld work on aluminum radiator?

JB Weld can be a good temporary fix for a leaking aluminum radiator, but it is not a permanent solution. You should take your radiator to a repair shop as soon as possible to have it properly fixed.

If your radiator is leaking, you’ll need to drain it and then clean the surface around the holes so that the epoxy bonds to the radiator. Apply the epoxy to the holes according to the manufacturer’s instructions and allow to dry thoroughly. Once dry, you can then refill the radiator and the leak should hopefully have stopped.

What kind of solder do you use for aluminum radiators

If you are soldering electrical wires together, always use electrical solder. This type of solder contains a rosin-core flux, which is necessary in order to create a strong and reliable connection. If you are soldering a non-electrical item, such as a radiator, you can use acid-core solder. This type of solder contains an acid flux, which helps to prevent oxidation and corrosion.

If you have a hole or leak in your car’s radiator, you will need to either repair it or sold it. If the hole or leak is not too big or wide, you may be able to solder it closed and repair the leak.

What J-B Weld is best for aluminum radiator?

J-B Weld RadiatorWeld Radiator Repair Kit is a product designed for permanent or temporary repairs of radiators made from metal and other materials. RadiatorWeld repairs cracks of 4″ or less and holes up to 1/4″ diameter.

Epoxy and tape are two common no-weld hole repair options. These do-it-yourself approaches are effective when repairing a small hole rather than a significant tear. Specialty epoxy and tape products are designed to patch steel and metal.

Will JB Weld seal a radiator?

J-B Weld is a trusted name when it comes to versatile and dependable adhesives, sealants and epoxy products. Professionals, mechanics and avid DIYers know that J-B Weld gets the job done right, no matter the size or scope of the project. Whether you’re working on a radiator, washer fluid tank, storage tank, water tank, plastic, composite or PVC surface, we have the right product for the job.

And sure enough when I put my head next to the radiator I can hear it hissing And I can see a faint light shining through the tiny valve at the top. So I know it’s not my imagination.

Can you use filler on a radiator

If you have small holes around your radiator pipes, you can fill them with filler. Once the filler is dry, sand it flat and paint over it. You can also use steel wool surrounded by caulk to fill the holes.

Aluminum is a difficult metal to solder because it is so highly reactive. You need to use a special aluminum soldering flux in order to get a good connection. Just because a flux is strong enough to solder an alloy like stainless steel doesn’t mean it’ll work on aluminum. Aluminum soldering fluxes are generally more expensive than other fluxes, but they are worth the investment if you plan on doing a lot of aluminum soldering.

Can you solder an aluminum radiator?

Super alloy one is a great product for sealing systems. It is easy to use and very effective. I would definitely recommend it to anyone.

The melting range of the solder is 370 to 430°C. 6061 aluminum has a melting point of 652°C. So, when soldering aluminum, you need to be careful not to overheat it and cause the aluminum to melt.

Will flex seal work on a radiator

Thank you for your question! We do not recommend using Flex Seal on surfaces where it comes in direct contact with drinking water, as it is not made to withstand extreme heat or pressure.

If you have a small coolant leak, you can try dropping a raw egg into the radiator. The egg will cook and harden, then clog up the hole that’s letting coolant leak out. This might work temporarily, but you should still take your car to a mechanic to have the leak fixed.

Can you weld an aluminum radiator?

The J-B Weld is a great solution for welding aluminum. The mixture of alcohol and J-B Weld creates a thinner that can be poured into the damaged areas of the radiator. The welded area then needs to be heated with a hair dryer to complete the repair.

MarineWeld™ is a powerful two-part epoxy cold weld system that can bond different or similar surfaces together, such as aluminum, metal, composites, fiberglass and others. It dries quickly and forms a strong, lasting bond that can withstand the rigors of the marine environment.

Warp Up

To fix a hole in an aluminum radiator, you will need to first clean the area around the hole. Next, use a thin layer of epoxy resin to fill the hole. Finally, use a piece of aluminum foil to cover the hole.

If your vehicle has an aluminum radiator, you’ll want to know how to fix a hole in it. First, clean the area around the hole with a wire brush and then apply a generous amount of epoxy resin to the area. Next, place a piece of aluminum foil over the hole and press it down firmly. Finally, apply another layer of epoxy resin over the foil and let it dry.

Clara is a radiator heating technician. She's been working in the heating and cooling industry for over 20 years, and she loves helping fix people's heating/cooling problems. In her spare time, Clara spends time writing articles!

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