While Subaru vehicles are known for their reliability, even the most well-engineered cooling systems can develop issues over time. Ignoring these Subaru cooling system service warning signs can lead to costly repairs and potential engine damage. That’s why it’s crucial to stay vigilant and address any concerns promptly.
Buddy Blichfeldt, Operations Manager at Quality Subaru in Wallingford, CT, understands the importance of catching cooling system problems early. “The more you can bring your vehicle in to have our technicians constantly looking at it, you’re just doing yourself such a service because they’re able to identify a problem before it becomes something major, major, major.”
Here are five warning Subaru cooling system service warning signs that your Subaru’s cooling system needs attention:

1. Low Coolant Level
One of the most obvious indicators of a potential cooling system issue is a low coolant level in the overflow bottle. As Blichfeldt explains, “If that is low when we do a visual, we got to determine where’s the fluid going, you know? There are two places it can go. There’s either an external leak or it’s burning it within the engine.”
A low coolant level could signify a leak in the system or internal consumption, both of which require prompt attention from a qualified technician.
2. Coolant Leaks
Speaking of leaks, any visible coolant puddles or stains under your Subaru should be cause for concern. Blichfeldt notes, “When we open the hood, there’s always some glaring Subaru cooling system service warning signs you can see if there’s anything leaking. When the vehicle’s up on the lift, when we’re performing an oil change, if we see coolant leaking or something like that externally, we know there’s an issue we must take care of.”
Coolant leaks can occur due to various reasons, such as damaged hoses, a cracked radiator, or faulty gaskets. Ignoring a leak can lead to complete coolant loss and potential engine overheating.
3. Overheating Issues
Subaru cooling system service warning signs will show if your Subaru’s temperature gauge reads abnormally high or you notice steam coming from under the hood, it’s a clear sign that your cooling system is struggling to keep the engine at the proper operating temperature. Continuing to drive in this condition can cause severe engine damage.
As Blichfeldt emphasizes, “If your vehicle were to overheat, that’s when you can cause major damage in terms of things warping. And when things warp, then seals fail within the motor itself, and you just run into so many internal engine problems.”
4. Unusual Noises from the Water Pump
While it may be challenging for the average driver to detect Subaru cooling system service warning signs, a trained technician can often identify issues with the water pump by listening for unusual noises or vibrations. Blichfeldt acknowledges, “Can a technician diagnose that and go, wow, that sounds loud, or this doesn’t sound right? Absolutely.”
A failing water pump can lead to improper coolant circulation and, ultimately, overheating if left unaddressed.
5. Debris Buildup in the Engine Bay
Living in New England, Blichfeldt stresses the importance of keeping the engine bay clear of debris that could obstruct airflow and impair cooling efficiency. “I know, especially, living in New England, we have the leaves that fall every year. And I think that’s a big one because, you know, you have all the areas where the vehicle is designed in the openings in the front of the vehicle to let airflow come through. If they are clogged with leaves then the cooling system is not working efficiently.”
He also recommends checking for rodent nests after winter, as they can cause damage to cooling system components or electrical wiring.
By staying vigilant for these warning signs and addressing any concerns promptly with the help of Quality Subaru’s expert technicians, you can help ensure your Subaru’s cooling system remains in top condition, preventing costly repairs and potential engine damage down the line.
FAQ
How often should I have my Subaru’s cooling system inspected?
It’s recommended to have your Subaru’s cooling system inspected during routine maintenance visits. Quality Subaru’s trained technicians can identify potential issues before they become major problems.
What should I do if I notice a coolant leak?
If you notice a coolant leak, it’s important to have your Subaru inspected by a professional as soon as possible. Continuing to drive with a leak can lead to complete coolant loss and potential engine damage.
Is it safe to drive with an overheating engine?
No, driving with an overheating engine can cause severe damage and should be avoided at all costs. If your temperature gauge reads abnormally high or you notice steam from under the hood, pull over immediately and have your Subaru towed to a qualified service center.
Can I check my Subaru’s coolant level myself?
Yes, you can visually inspect the coolant level in the overflow bottle under the hood. If it appears low, it may indicate a leak or internal consumption, and you should have your Subaru inspected by a professional.
How can I prevent cooling system issues?
Regular maintenance at Quality Subaru is crucial for identifying and addressing potential cooling system problems before they become major issues. Additionally, keeping the engine bay clear of debris and checking for leaks can help prevent cooling system failures.