What is a coolant reservoir?
A coolant recovery reservoir (or overflow tank) collects pressurized coolant from the engine’s cooling system to help determine coolant levels.
As your vehicle continues to run and burn fuel, it produces high amounts of heat. To manage the heat levels within your vehicle, the coolant recovery reservoir uses a pressurized cap so the excess coolant is able to enter the reservoir only when enough pressure has been applied.
Once the coolant is expelled through the overflow tank/coolant reservoir, it flows through the pipes around your engine’s cylinders, is converted into gas, and then is transformed back into a liquid to rid your vehicle of excess heat.
When should I replace the coolant recovery reservoir in my car?
Your car’s coolant recovery reservoir should only need to be replaced if there are visible signs of damage. Some symptoms of a broken coolant recovery reservoir are:
Leaking coolant: If your coolant isn’t holding in your overflow reservoir, it’s more than likely that you are experiencing a coolant leak. A coolant leak can cause your coolant to evaporate slowly and, in more severe cases, can create a mix with your engine oil.
Coolant light is on: A coolant light on your dashboard is a sign that there is something wrong with your vehicle’s cooling system. In this scenario, it’s best to check your coolant system, as there could be an issue with your coolant recovery reservoir or overflow tank.
Engine overheating: The coolant system is designed to bring down your car’s heat levels. When coolant levels drop too low (either from a crack or coolant leak), your engine can quickly overheat, causing steam from under the hood, wheel well or front fender.
Sweet odors: Odors are more often than not a signal that something is wrong internally with your car. If you notice a sweet smell from under your hood, it could be the result of a faulty or defective overflow tank or recovery reservoir, indicating a leak. Left untreated, it can damage your car’s cooling system and engine.
How often should a coolant reservoir be replaced?
A car’s coolant recovery reservoir should be replaced only as required. Oftentimes, your car’s coolant recovery reservoir will last for 8-10 years and will only need to be replaced if it becomes defective.
Keep in mind: Your car’s coolant, which fills the coolant reservoir, does need to be replaced every 30,000 miles or five years with new coolant. Low coolant levels can become acidic and destroy your engine.
Can I replace my coolant recovery reservoir myself?
Yes. Each car’s cooling system is located in a different location based on model and make. However, once you locate it, it’s possible to remove and replace it yourself.
It’s important to note that there is a potential of getting burned when operating on a coolant recovery reservoir, as coolant maintains a high temperature (near boiling). When completing a coolant recovery reservoir replacement, do not touch hot coolant and make sure to work at a cool operating temperature.