How to Use Block Radiator Sealant on Large Leaks How to Use Block Radiator Sealant on Large Leaks

What You'll Need
Radiator sealant
Socket wrench
Engine coolant
Container for radiator fluid

Radiator sealant is the best way for you to be able to get leaks stopped. However, if you are attempting to stop larger leaks then you will have to keep a few things in mind. Larger leaks require a bit more work and care to make sure that they are able to get the job done correctly. You may eventually need to get a more permanent solution as large leaks tend to grow. However, with the right sealant and work you will find that you will slow down large leaks from growing for quite a long time.

Step 1 – Locate Drain Plug

You will need to begin by getting underneath your vehicle and finding the coolant drain plug. It is typically on the passenger side on the bottom of your radiator. With your socket wrench, get the plug removed and get your container ready for the radiator fluid to flow out. Allow all of the fluid to leak out before you move on to your next step. Make sure that you put your container in a safe place where no children or pets will be able to get near it.

Step 2 – Prepare Sealant

It is important that the sealant that you get is heavy duty. Since it is working for a large leak you will need to make sure that you find one that is going to be able to do the job well. Follow the instructions that come with the sealant carefully. You will need to do them correctly or they will not be able to work properly.

Step 3 – Apply Sealant

Once you have your sealant prepared per the instructions you are ready to apply it. Each type of sealant will be different so you will need to make sure that you continue to read the directions even after you have finished making it. You will typically fill your radiator with the solution until the radiator is full. The sealant will need time to set inside of the radiator. For larger leaks it may need to set longer than it would for smaller ones.

Step 4 – Remove Sealant

Once the sealant has had time to set for as long as it needs you are ready to remove it. You will simply need to get back underneath your vehicle and get the drain plug removed again using your socket wrench. You will let the solution completely leak out; get a container for this as well. You will need to properly dispose of the old radiator liquid as well as the solution. From there, you are ready to fill your radiator back up with half water and half radiator fluid. Turn your car on and keep an eye out for leaks.

Step 5 – When All Else Fails

If you are still having leaks then you may have to end up getting a new radiator. Large leaks are difficult to slow down with a sealant. In the end, you may have to wind up purchasing a new radiator.

Got a New Project You're Proud of?

Post it on Your Projects!