How to Repair a Seam Crack on a Radiator

Occasionally, the radiator in your vehicle can develop cracks near the seams, causing your engine to overheat or more severe problems. Extreme fluctuations in temperature as well as driving conditions and normal usage can cause the radiator to wear out and create the cracks near the seams. You can repair the tank yourself in two to four hours and save the time and expense of having to take the radiator into a shop or having someone else do the work for you.

Instructions

1

Inspect the radiator and locate the crack in the seam that needs to be repaired using a flashlight to examine the tank.

2

Locate the drain plug on the bottom of the radiator and place a drain pan below the plug.

3

Take the cap off the top of the radiator and open the drain valve with an open end wrench, letting the coolant drain completely out of the tank.

4

Sand down the area around the crack with a piece of emery cloth to remove any debris or metal pieces that could hinder getting a good seal.

5

Place a thick bead of epoxy sealer or use a hot glue stick that resists high heat using a hot glue gun over the cracks in the seam, spreading the sealant out to cover the cracks completely and allow the compound to dry for a couple hours.

6

Close the drain valve of the radiator with an open end wrench and pour a quart of radiator sealer into the tank, filling the tank the rest of the way with water.

7

Place the cap back on the radiator and turn the car motor on, letting it idle for about five minutes to allow the radiator sealer to spread throughout the tank.

8

Turn the engine off and let it cool down for about 15 minutes.

9

Move the drain pan and place a plastic container under the drain valve and take the cap off the radiator.

10

Open the drain valve with the open end wrench and allow the tank to empty completely.

11

Close the drain valve with the open end wrench and fill the radiator with coolant.

12

Place the radiator cap back on top of the tank and dispose of the drained coolant and fluid at your local recycling center or automotive center.