Faulty thermostat valve: A fault in the thermostat housing may prevent the thermostat valve from opening, resulting in the engine overheating.You’ll notice a leak in the radiator coolant overflow tank when this happens. Too much fluid: If there’s excess fluid in the coolant overflow tank, it’ll leave no space for the hot coolant to expand.So, you’ll notice a coolant leak if this component is loose or damaged. Faulty head gasket : The head gasket creates a seal between the water and engine oil channels and the combustion chamber.Bad radiator cap : A bad radiator cap could release the coolant fluid into the expansion tank too quickly, resulting in a coolant leak in the overflow tank.Here are some reasons why your engine coolant reservoir could be overflowing: What Causes The Coolant Reservoir Tank To Overflow? You’ll notice the temperature gauge flickering on your dashboard when this happens.īesides these faulty reservoir tank symptoms, you could also have an overflowing coolant tank. Engine Overheatingīad coolant reservoirs may fail to store the excess coolant or combat the increased pressure, resulting in the engine overheating. Typically, this indicates a coolant leak within the engine compartment and must be diagnosed soon. If you’ve noticed a sweet smell (like maple syrup) from the front of your vehicle or throughout the cabin, it could be due to a bad overflow reservoir tank. Note: A coolant leak could also happen due to a damaged reservoir cap, radiator hose (also referred to as coolant hose), or radiator filler neck, resulting in a low coolant level. When the coolant level is low, the ECM (Engine Control Module) will log DTC P2560. Depending on the severity of the damage, you’ll notice small or large coolant fluid stains under your vehicle.

Low Coolant LevelĪ damaged or faulty engine coolant reservoir could result in your coolant level constantly running low. Here are some obvious signs of a faulty or damaged coolant overflow tank: 1. So, how do you identify a bad radiator coolant overflow tank ? 3 Symptoms Of A Bad Coolant Reservoir

But their location, function, and design make them susceptible to wear and tear, affecting your vehicle’s performance. When you turn off your vehicle, this excess coolant fluid is brought to an acceptable temperature, ready to be recirculated into the engine.Ĭoolant reservoirs are made from high quality materials. The pressure cap relieves this pressure by sending the boiling coolant fluid through the radiator hose and thermostat housing into the coolant reservoir (also known as the expansion tank. Eventually, the coolant fluid reaches a boiling point, increasing the pressure within the system. Some of these key components are as follows:Īs the coolant circulates through the engine compartment, it absorbs the heat produced by the engine. They do this by circulating the coolant through the engine, ensuring it’s well-lubricated and running smoothly. This system has many components that work together to prevent the engine from overheating. The engine’s coolant system operates on a closed-loop circuit, meaning nothing can enter or leave the system (unless there’s a leak.) It’s responsible for storing the hot coolant fluid until the engine has cooled down.īut how does this system work? Let’s dig a little deeper. The coolant reservoir or overflow tank is a translucent plastic tank mounted on the engine bay. The Role Of The Coolant Reservoir In The Engine’s Cooling System

How Much Does A Coolant Reservoir Tank Replacement Cost?.

Can I Drive With A Damaged Coolant Reservoir?.

What Causes The Coolant Reservoir Tank To Overflow?.

The Role Of The Coolant Reservoir In The Engine’s Cooling System.

Ac delco coolant reservoir cap