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Mercedes Benz ML320 Radiator

Common Causes of Mercedes Benz ML320 Radiator Failure

As a component that is regularly exposed to extreme temperature and pressure, your Mercedes Benz ML320 radiator was definitely designed to take the heat. However, old age, improper maintenance, and other external factors will eventually catch up with your radiator and cause it to fail. If you feel that your radiator has not been up to par lately, it's time to check under your hood to know what's causing the issues. Here are some of the most common signs of radiator trouble:

Car overheating

An overheated engine is one of the most common symptoms of a radiator problem. To be able to maintain optimum engine performance, fuel economy, and emissions levels, your SUV should operate within 195 to 220 degrees Fahrenheit. If your Mercedes easily overheats even during the winter, then you are probably running low on coolant. Open your radiator cap and check if your coolant and fluid mixture is at the proper level specified in your vehicle's service manual.

Aside from making sure that you radiator has the right amount of coolant, you should also check for contamination in your coolant and water mixture. Rust and debris in your coolant and water mixture can also lead to your engine overheating from a restricted radiator.


If you notice that your coolant level is suddenly low again even though you have just topped up your coolant and fluid mixture, you probably have a radiator leak. Many radiator leaks are caused by corroded components, radiator sealant that refuses to hold up, and worn-out solders and fittings. Since coolant is easy to distinguish from the other fluids in your system, it is quite simple to know if you have leaking radiator hoses or seals.

Other troubleshooting techniques

There are some cases when your radiator might not be defective yet, but problems with other related components led to the premature failure of this component. When troubleshooting your radiator, it is also advisable to look out for inaccurate thermostats, worn-out or brittle hoses, leaky seals, fittings, gaskets and heater core, and even a couple of electrical problems.

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  • Keeping Your Mercedes Benz ML320 Radiator in Tiptop Shape

    Pulling over to the side of the road because there is smoke rising from your engine bay is a scenario that no driver wants to be in. Luckily, if you keep your radiator and other cooling system components in check, you won't have to experience these overheating troubles. To ensure that you get the most out of your Mercedes Benz ML320 radiator, take note of these simple maintenance tips:

    Maintain the correct coolant and fluid mixture.

    Aside from ensuring that your coolant is topped up, it is also very important to use the proper coolant and fluid mixture for your radiator. Most vehicle manufacturers require a 50-50 coolant and water mixture for their radiators. During the winter, the level of coolant can be increased up to 69% to avoid freezing the mixture.

    Regularly check your radiator hoses for leaks.

    Since radiator hoses are very prone to leaks, checking them regularly for holes and cracks is also part of good radiator maintenance. Inspect your radiator hoses for any leaks that might be causing the low coolant level in your radiator. Brittle and worn-out hoses should also be replaced as soon as possible even if they don't have any holes.

    Keep your radiator clean.

    Over time, your radiator can accumulate dust, bugs, rust, and other debris that might hamper its performance and cause it to overwork. Cleaning the components of your radiator regularly will help eliminate overheating that results from clogged radiators.

    Use only manufacturer-approved coolant.

    Some drivers use the cheapest type of coolant for topping up, but using an incompatible type of coolant can lead to a damaged radiator. Most vehicle radiators perform well with a glycol-based coolant, but it would be better if you consult your service manual to ensure that you are getting the best coolant for Mercedes Benz.

    Flush out your old coolant and fluid mixture.

    To guarantee that your coolant and water mixture is free from contaminants, it is advisable to flush out the mixture every two years. Plain water can be used to flush out your radiator, but if you want a more thorough cleaning, you can use a commercial radiator flush for this procedure.