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Mazda Protege Radiator Overflow Tank

The Three Signs of a Problematic Mazda Protege Radiator Overflow Tank

Your Mazda Protege radiator overflow tank receives the expanded coolant that was released by the radiator due to extreme heat and pressure. Aside from that, it also prevents the radiator hoses and other cooling system parts from blowing up. Over time, the radiator overflow tank will wear down and may cause the coolant to leak or the engine to overheat. When you already notice that your car's cooling system is acting a weird, you should pop the hood and do some troubleshooting. Here are some of the problems you might encounter:

Decrease in engine coolant level

A crack in your Mazda Protege radiator overflow tank is one of the causes for the coolant to leak, and you will notice the level of coolant in the reservoir slowly decrease or a puddle of coolant under your car. Although there are different causes of a leaking coolant, it is easy to check if the problem is caused by the radiator overflow tank because you can simply look for the crack or the hole on its surface. To solve this issue, you can use plastic or epoxy welds to cover the crack of the overflow tank. However, if this doesn't work and the coolant is still leaking, then it's time for you to find a replacement radiator overflow tank.

Increasing engine temperature and overheating

Other symptoms of a faulty radiator overflow tank include the sudden increase in the engine temperature and overheating. Although there can be other causes for your car's engine temperature to increase or the engine to overheat, you should check the overflow tank because it can be a possible culprit. However, before you do this, you should let your vehicle cool down first to avoid any injury. When the car finally cools down, you should pop the hood and find holes or cracks on the tank's surface.

Bubbling coolant

Bubbles inside the radiator overflow tank are actually a common occurrence because the tank's function is to remove these bubbles from the coolant in your car's cooling system. However, this could also be a sign of a leak at the head gasket. You can test each cylinder using a cylinder leakage tester and observe if there are bubbles present. If there's none, then the bubbles inside the radiator overflow tank are completely normal.

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  • Mazda Protege Radiator Overflow Tank: Tips on How to Maintain It Properly 27 February 2013

    Your Mazda Protege radiator overflow tank makes sure that the coolant that has overflowed from the radiator is caught properly to avoid leaking or spilling. Aside from that, it also prevents the buildup of pressure when the coolant heats up and expands which can cause severe damage to other parts of the engine's cooling system. Since the tank is dealing with constant pressure and high temperature, it will eventually show signs malfunction and wear down. To avoid and detect any problems before they happen, here are some easy maintenance tips you can follow:


    Clean the radiator overflow tank.


    Rust and mineral particles can buildup on your Mazda Protege radiator overflow tank, and before you know it, there's already an ugly orange stain around the tank's rim and on its surface. You can solve this problem by removing the tank from your car with simple garage tools and by cleaning it with a calcium-lime-rust remover. To clean the inside of the tank, you should fill it with undiluted calcium-lime-rust remover up to the brim and let it stay for until the dirt and rust are removed. Alternatively, you can immerse the tank in a bucket filled with the cleaning agent. This will clean not only the inside of the tank, but its surface as well.


    Inspect the condition of the tank periodically.


    Checking the condition of the radiator overflow tank can help detect problems before they become critical. What you need to do is to look for cracks and holes on the tank's surface because these may cause the coolant to leak and the engine to overheat. Small cracks or holes can be repaired with silicone glue. However, if the crack is too big, then you have to consider replacing the tank. Just make sure that when you remove the radiator overflow tank, the hoses between the radiator and the reservoir are routed correctly so they won't kink and block the flow of the coolant.


    Check the coolant level inside the tank.


    Probably the easiest maintenance tip you can perform every day, checking the coolant level of your car has to be included in your maintenance routine. The radiator overflow tank of your Mazda Protege is usually located near the lower radiator hose, and the plastic tank is already designed with level indicators so you could see the coolant's level easily. You should take notice of the coolant's level because a sudden decrease may be a sign of a problematic overflow tank.