What is a coolant reservoir?
A coolant reservoir works together with the expansion tank and radiator to cool your vehicle and regulate heat from the engine. Coolant reservoirs store additional coolant fluid and expel it back into the radiator once it’s cooled. A cracked or leaking coolant reservoir can lead to further damage to your cooling system if left unchecked.
When should I replace the coolant reservoir in my car?
Coolant reservoirs don’t need to be replaced often—but they do require regular maintenance to prevent corrosion, cracks, and leaks. If you experience any of the following, it might be time to consider a coolant reservoir replacement:
Low coolant: Find yourself replacing coolant more often than usual? Cracked or leaking coolant reservoirs, much like defective expansion tanks, can make the coolant evaporate at a slower rate. In worst case scenarios, your coolant can mix with your engine oil, diluting and contaminating your oil supply.
Overheating: If your engine is overheating, this is a serious signal that your coolant reservoir is defective. As a failing coolant reservoir is unable to hold coolant, or manage pressure, your vehicle is unable to cool down, resulting in overheating.
White exhaust smoke: A lesser known symptom of reservoir damage is white exhaust smoke. This could mean you have a leak, and your oil is mixing with your coolant.
Odors: Smell is also a common symptom, as with a leaked or cracked reservoir, the smell of your dispelling coolant will come through air vents and into your vehicle.
How often should a coolant reservoir be replaced?
Most coolant reservoirs last for several years before needing to be replaced—however, this depends on your driving and maintenance habits. As such, it’s important to perform routine inspections on your vehicle’s coolant reservoir to ensure there is no damage or deterioration.
Can I replace my coolant reservoir myself?
Yes—if you’re confident in your mechanical knowledge and DIY capabilities. Replacing a coolant reservoir tank requires a mid-level understanding of your car’s engine, heating cycle, and cooling systems. Not sure of your abilities? Take your vehicle to a licensed mechanic for further assistance.