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Jeep CJ5 Radiator Overflow Tank

Jeep Cj5 Radiator Overflow Tank Troubleshooting

Everybody needs some backup every once and a while, and that's exactly what the overflow tank is to your radiator. When the coolant in your radiator gets too hot, it overflows. To ensure that this vital coolant doesn't go to waste, it is stored in the radiator overflow tank. And when the engine cools back down, the coolant is sucked back into the radiator. If your Jeep Cj5 radiator overflow tank becomes damaged, then it could lead to unwanted radiator and engine issues. To help you diagnose and solve such problems, here are some overflow tank troubleshooting tips.


A radiator overflow tank leak can become your greatest enemy as this would deplete your vehicle of coolant, which could lead to engine and overheating problems. Leaks are often caused by cracks in the tank that are brought about by wear and tear. Check your overflow tank to see if it has crack or if it is leaking. If either situation seems to be the case, then seal up the cracks to stop the leaks.


When you inspect your radiator overflow tank, keep an eye out for rust. If you don't spot the rust, then check your actual coolant. If there is a reddish, clay substance inside your coolant-or if the coolant itself shows a brownish color-then you likely have a rusted overflow tank. There are methods of removing rust in order to get your tank back to prime form and keep the coolant clean. However, if the rust has caused serious corrosion, then you're better off having the entire tank replaced/.

Loose brackets and bolts

A radiator overflow tank is typically held in place by brackets that bolt it to the vehicle. If ever these bolts come loose or your brackets break, then your tank may not be able to store the coolant properly. In addition to that, a tank that isn't properly supported could lead to tank leakage as well. When you check the condition of your tank, be sure to inspect its bolts and brackets. If these have come loose or are damaged, then have them replaced.

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  • Maintenance of the Jeep Cj5 Radiator Overflow Tank

    To be able to ensure that your Jeep Cj5 radiator overflow tank remains in superb condition for as long as possible, you'll have to keep it well maintained. So here are some simple tips to help you do so.

    Tighten bolts

    Your radiator overflow tank is help in place by brackets that are bolted on to it. If these brackets become damaged, you'll have to replace it right away. On the other hand, if your bolts come loose or get broken, then you need to either tighten them or have them replaced. By doing so, you'll be able to see to it that your overflow tank is always in properly supported.

    Remove rust

    To get rid of rust in your radiator overflow tank that could contaminate your coolant, clean out the tank. By flushing the coolant out of your tank and replacing it with new coolant, you'll be able to preserve the condition of your tank. In addition to that, you can try a home-remedy of mixing water and molasses and pouring this into the overflow tank. This should remove the rust inside it; just be sure to rinse your tank regularly afterwards since molasses could eventually eat into steel parts.

    Seal leaks

    When your overflow tank leaks, then your radiator looses coolant and is incapable of keeping your engine from overheating. To remedy this problem, keep an eye out for cracks in the tank that leak out the coolant. You can seal these cracks with anti-leak, which can be bought at auto appliance shops. You can also use epoxy products like JB weld items to seal off any unwanted cracks. By preventing leaks, you'll be able guarantee long-lasting overflow tank functionality.

    Clean the tank

    It's important that you keep your overflow coolant tank clean both inside and out. To do this, remove the tank and fill it in with undiluted calcium-lime-rust remover. After letting this substance sit in the tank, empty it, rinse it with water, and then fill it back up, but this time, with a 3:1 ratio of water and bleach. Let this mixture sit, then rinse the tank out with water and then repeat the process. This cleans your tank out of gunk and helps to prolong its longevity.