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Do subarus lose coolant?

As a seasoned auto service provider, I often encounter questions about specific vehicle issues, and one common concern among Subaru owners is coolant loss. Understanding why this happens and how to address it is crucial for maintaining your vehicle's health. In this article, we will explore the reasons Subarus may lose coolant, the signs to watch for, and what steps you can take to prevent potential problems.


Why Do Subarus Lose Coolant?


Coolant loss in Subarus can occur for several reasons, and it's essential to identify the underlying issue to prevent further damage to your engine. Here are some common causes:



  • Leaks in the Cooling System: Over time, hoses, gaskets, and seals can wear out, leading to leaks. This is one of the most frequent reasons for coolant loss.

  • Head Gasket Failure: Subarus are known for their boxer engines, which can be prone to head gasket issues. A blown head gasket can allow coolant to escape into the engine or exhaust system.

  • Radiator Issues: A damaged or corroded radiator can also lead to coolant leaks. Regular inspections can help catch these problems early.

  • Water Pump Failure: The water pump circulates coolant throughout the engine. If it fails, it can cause coolant to leak or not circulate properly.


Signs of Coolant Loss


Being aware of the signs of coolant loss can help you address issues before they escalate. Look out for the following indicators:



  • Overheating Engine: If your engine temperature gauge rises above normal, it may indicate a coolant shortage.

  • Low Coolant Levels: Regularly check your coolant reservoir. If you notice it consistently low, investigate further.

  • Sweet Smell: A sweet odor around your vehicle can indicate coolant leakage.

  • Puddles Under the Car: If you see green or orange fluid under your Subaru, it could be coolant.


Preventing Coolant Loss


To minimize the risk of coolant loss in your Subaru, consider the following maintenance tips:



  • Regular Inspections: Schedule routine checks of your cooling system, including hoses, gaskets, and the radiator.

  • Use Quality Coolant: Always use the manufacturer-recommended coolant to ensure optimal performance.

  • Monitor Engine Temperature: Keep an eye on your temperature gauge and address any overheating issues immediately.

  • Address Issues Promptly: If you notice any signs of coolant loss, take your vehicle to a trusted mechanic as soon as possible.


In conclusion, while coolant loss can be a common issue for Subaru owners, understanding the causes and signs can help you maintain your vehicle effectively. Regular maintenance and prompt attention to any problems can keep your Subaru running smoothly for years to come.

Frequently Asked Questions

Is it normal for coolant to disappear over time?


The level of coolant in your vehicle will decrease over time, but usually at a slow rate of only two to three ounces a year. This equates to approximately 0.25% every four to six months. A good rule of thumb is to have the coolant system flushed and changed about every 50,000 to 80,000 kms.



Can a car lose coolant without a leak?


Most engines lose a little coolant over time even if there are no leaks. When you stop an engine, heat soak will cause some coolant to be pushed into the coolant reservoir. That fluid is hot and some water evaporation will find its way out via the reservoir vent.



Does coolant disappear over time?


The level of coolant in your vehicle will decrease over time, but usually at a slow rate of only two to three ounces a year. This equates to approximately 0.25% every four to six months. A good rule of thumb is to have the coolant system flushed and changed about every 50,000 to 80,000 kms.



How do I know if my Subaru needs coolant?


As you stand in front of it it's clearly marked says coolant on the top. See the owner's manual for the specific fluids to put in it most of the time this can be just topped off with. Water.



Why is my Subaru losing coolant?


If your Subaru keeps running low on coolant, you have a problem that needs to be fixed. The most common causes of coolant leaks in Subaru's are; having a faulty or loose radiator cap, a damaged radiator, a failing water pump, degraded/damaged coolant hoses, a failed heater core, or failed head gaskets.



How long does Subaru coolant last?


As Buddy Blichfeldt, operations manager at Quality Subaru, explains, “The coolant that Subaru specifies and has manufactured is to such a high standard that it's designed to last for 11 years or 137,500 miles.” However, some owners may prefer more frequent Subaru cooling system flush service for added peace of mind.



How is my coolant disappearing?


The most common reason behind an internal coolant leak is head gasket problems. A leaky or blown head gasket is often what causes coolant to leak internally.



Do subarus go through coolant?


Regular maintenance: Ensure that your Subaru undergoes regular maintenance, including coolant flushes, to keep the engine coolant system in top condition. Check coolant levels: Regularly check your coolant level and top it up if necessary.



Is it normal for a car to go through coolant?


Check for Leakage
always. Disappearing engine coolant could be the result of a slightly cracked hose, a tiny hole in your radiator, or a water pump issue. It's also possible for a coolant leak to develop inside your vehicle or to simply vaporize into mist via your defroster.



How often should I replace my Subaru coolant?


Engine coolant circulates through the engine to dissipate the heat generated by internal combustion. Genuine Subaru Long Life Super Coolant is pre-diluted and doesn't require water. The coolant replacement interval is typically 11 years or 137,000 miles.


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.