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How do I know if my truck is low on coolant?

If your truck is running low on coolant, it's important to address the issue promptly to prevent overheating and potential engine damage. Here are some signs that your truck may be low on coolant, and steps you can take to check and refill the coolant as needed.


Signs Your Truck is Low on Coolant



  • Temperature gauge reading high: If your truck's temperature gauge is reading higher than normal, it could be a sign that the coolant level is low.

  • Steam or smoke coming from the engine: If you notice steam or smoke coming from under the hood, it's a clear indication that the engine is overheating due to low coolant.

  • Coolant leaks: Check for any visible leaks around the radiator, hoses, or other coolant system components. Leaks can cause the coolant level to drop.

  • Low coolant level in the overflow tank: The overflow tank, also known as the coolant reservoir, should be filled to the appropriate level. If the level is low, it's a sign that you need to add more coolant.


If you notice any of these signs, it's important to address the issue as soon as possible to prevent further damage to your truck's engine.


Checking and Refilling Coolant


To check the coolant level in your truck, follow these steps:



  1. Park your truck on a level surface and apply the parking brake.

  2. Wait for the engine to cool completely before opening the coolant system. The system may be under pressure, and opening it while hot can be dangerous.

  3. Locate the coolant overflow tank or reservoir, usually located near the radiator.

  4. Check the coolant level in the tank. It should be between the "MIN" and "MAX" markings.

  5. If the level is low, add the appropriate coolant mixture (usually a 50/50 blend of coolant and water) until it reaches the "MAX" mark.

  6. Start the engine and let it run for a few minutes, then recheck the coolant level and top it up if necessary.


Remember to use the correct coolant type recommended by your truck's manufacturer, and never mix different types of coolant. If you're unsure about the process or have any concerns, it's best to consult a professional mechanic.

What happens if my truck is low on coolant?


Without sufficient coolant, your engine could overheat. Many modern vehicles have an automatic engine cut-off feature when the engine overheats to help prevent significant damage. If this happens, it's best to tow your vehicle to your nearest automotive professional for a proper diagnosis.



Can I still drive my car if coolant is low?


That's why the moment you notice leaking coolant or a low coolant dashboard warning light, you should seek a comprehensive coolant service. In short, the answer to "Can you drive without coolant?" is a resounding "No," and ignoring the low or no coolant warning signs can result in a vehicle that no longer functions.



What are the symptoms of low coolant level?


Low coolant also causes your engine to burn fuel more quickly. You will notice symptoms such as poor fuel economy, a loss of acceleration, and the car's high-temperature gauge getting close to the red if your car is low on coolant. All of these signs mean that you should put more coolant into your car.



How do I know if my truck needs coolant?


On the side of the reservoir, it has an L(low) and F(full) markings, and as the tank is translucent, you can see your coolant level without opening the cap. If the fluid is close to or below the L marking then you need to add more coolant to the reservoir.



Can I put new coolant on old coolant?


Generally speaking, it's not safe to mix different types of coolant as this can lead to corrosion and other problems with your car's engine.



Can you just add coolant if it's low?


If the coolant level is low, add the correct coolant to the reservoir (not the radiator itself). You can use diluted coolant by itself, or a 50/50 mixture of concentrated coolant and distilled water. When coolant rises to the cold fill line, replace cap and tighten it until you feel it click.



How do you know if you are losing coolant?


Heat problems - If you begin seeing your vehicle's dashboard temperature gauge rising, this is due to the coolant becoming hotter. Less coolant means a smaller volume of coolant to dissipate heat, so this may be a symptom of a coolant leak too. Dashboard lights - Your dashboard lights can also indicate a coolant leak.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.