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Volkswagen Jetta Radiator

Understanding Common Volkswagen Jetta Radiator Troubles

Your Volkswagen Jetta radiator is very efficient and reliable when it comes to keeping your engine cool, but it is still not safe from various forms of damage. Since a failed radiator leads to a lot of safety issues, it is very important to diagnose radiator problems as soon as possible.

Inconsistent radiator performance

If your Volkswagen Jetta radiator seems to perform perfectly until you start speeding up on the freeway, there's a big chance that something is restricting the flow of coolant within your radiator. Clogged radiators often show signs of failure at high speeds, so you should check for blockages if your engine's temperature suddenly spikes when you're going fast. Some common sources of radiator clogging include dirt, bugs, and rust.

Excessive pressure

If your Volkswagen Jetta usually overheats because there is too much pressure inside your radiator, you probably have a faulty radiator cap. A problematic radiator cap usually results from seals that have been damaged by coolant that boils and overflows from the radiator. To avoid coolant overflow, make sure that the spring on your radiator cap is not stuck due to dirt and debris. Try checking for signs of corrosion on your radiator cap, since this can also be a common cause of boiling and overflowing coolant.


Low coolant level due to coolant leakage is also a major cause of radiator problems. If you have been constantly refilling your radiator with coolant only to find out that most of it is gone by the end of the week, it's time to examine your radiator hoses for any holes. If you have replaced your radiator hoses but you are still spotting coolant deposits under your vehicle, the leak is probably on the radiator itself. Try checking for bubbles or steam coming out of your radiator to identify the location of the leak.

Other common culprits

Leaking and overheating are the most common symptoms of radiator failure, but it doesn't mean that you don't have to check out other components in your vehicle's cooling system. Many radiators have failed because of faulty thermostats, water pumps, and radiator fans, so make sure that you inspect these components for any defects as well. It is also advisable to do a visual inspection on your radiator to check for blown seams, worn-out solders, and leaky fittings.

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  • Getting More Mileage out of Your Volkswagen Jetta Radiator 27 February 2013

    With all the heat and pressure that your vehicle's radiator has to take, it's no wonder you're your Volkswagen Jetta radiator eventually gives in to wear and tear. A faulty radiator can lead to overheating problems that cause major damage to other vital components of your vehicle, so it's very important to ensure that your radiator is in tiptop shape. Keeping your engine cool is a tough job for your Volkswagen Jetta radiator, but you can help it perform better for longer by following these maintenance tips:

    Keep your coolant at the proper level.

    Since one of the main causes of overheating is a low coolant level, it is very important that you keep your coolant and fluid mixture topped up. Check your Volkswagen Jetta's service manual for the correct coolant level and make sure that you only use the type of coolant that is approved for your Jetta.

    Take your vehicle for a radiator check-up every two years.

    Most mechanics agree that bringing in your radiator for professional maintenance every two years can extend the component's serviceable life. A professional radiator service usually takes care of the most common causes of radiator problems. This service usually involves flushing out the coolant, checking the thermostat, fans, and radiator cap, and fixing any radiator leaks.

    Replace your damaged radiator cap.

    A defective radiator cap will not be able to release excess pressure from your radiator, so make sure that you replace the cap if it can't perform its job properly anymore. Replace the radiator cap if it has worn-out seals, a faulty spring, or corroded parts. It is also advisable to replace the radiator cap each time you drain and refill the coolant in your radiator.

    Visually inspect your radiator for signs of damage.

    Many external factors can take their toll on your radiator as well, so it's important to give your radiator a visual inspection from time to time to check for any physical damage. Look for rusted radiator fins, cracked tanks, and brittle hoses and replace them when necessary. Replacing these worn-out components as soon as possible can keep you from having to replace your entire radiator.