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How to Fix a Radiator
Instructions
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Find the origination of the leak by looking for its path. You may not need to fix the car radiator; the leak may come from one of the hoses instead. To check, open the hood and allow the engine to run until it's warm. You will see the leak immediately if it's in the hose. Replace the hose, which is relatively inexpensive to fix.
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Check around the radiator cap for leaks. If there's liquid present, you may need a new cap or additional gasket.
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Patch the leak on the outside, if the radiator is leaking at the seam. Use a metal patching product, usually a putty-like product that hardens overnight. Put the putty on the leaky seam, work it in, allow it to harden and retest. This should temporarily fix your radiator.
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Use a leak stop additive that can be used with antifreeze for an easy fix. Simply follow the manufacturer's directions. Most of the products require you to add the stop leak and drive until the engine is warm.
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Drain the radiator if you use an additive that can't be mixed with coolant. Flush the radiator with plain water and fill with water. Mix in the additive and drive about 80 miles to allow it to work. Drain the radiator again and let it dry out. Refill with coolant, and the leak should be sealed.
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Glue the overfill bottle if the leak stems from a hole or crack in it. Use an epoxy made for plastic to fill any holes.
Tips & Warnings
- If you find a lot of rust on the radiator, especially underneath, you may need to replace it.
- If you have a leaky hose, and no way to get to the parts shop, wrap the hose in duct tape. It's useful for short distances. Check the hose thoroughly to make certain that the tape contains the leak.
- Read the label of any additive to make certain that it's completely safe for your car. Some additives can clog a car's cooling system.
- Always carry extra water or a container of radiator fluid. This will help you out of a jam if a temporary fix doesn't work.
- Don't just continuously fill the tank if you notice a leak. It's too risky and too costly once you calculate the cost of fluid.
- Be careful when you drain the radiator fluid. It's toxic to small animals and children, so dispose of it correctly.
- Make certain that the engine is cool before you open the radiator cap. If you must open it when it's hot, go slowly and allow the pressure to be released first. Then remove the cap.
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