Get High Quality Coolant Expansion Tank At an Affordable Price

coolant expansion tank

You’re driving along, and your engine suddenly starts to overheat. You decide to stop at a nearby garage, and the mechanic tells you that your coolant expansion tank is faulty. What does he mean by this? We explain here so that you can understand how important it is to inspect this part of your car regularly.

What Is A Coolant Expansion Tank?

A coolant expansion tank is a reservoir for coolant. The purpose of this reservoir is to store excess coolant and prevent overfilling the cooling system. When the engine heats up, the coolant expands and can spill out of the radiator if it is not contained in an appropriately sized expansion tank.

Coolant Reservoirs tanks are usually located in the engine compartment (or underhood) on most vehicles and are made from plastic to resist corrosion from sitting in an exposed area. They are vital to your car’s cooling system because, without one. There would be no place for the excess liquid to go when things get hot!

How To Know If Your Coolant Expansion Tank Is Faulty

When you suspect that your coolant expansion tank may be faulty, there are several ways to determine this.

  • Check for leaks. One of the most common problems with coolant expansion tanks is developing leaks. If you have a leaky coolant expansion tank, it will require repair or replacement as soon as possible. Suppose a leak occurs in another area of your vehicle’s cooling system and allows the water pump to suck up air instead of coolant. In that case, this can lead to overheating problems which could cause damage to other parts of your engine. Such as pistons and cylinders.
  • Examine for cracks in the tank body or lid that may cause corrosion over time by allowing moisture inside the container itself where it could corrode metal components such as bolts/screws holding everything together and heating elements (if applicable).

Main Signs Of A Faulty Coolant Expansion Tank

  • The main sign that you have a faulty coolant expansion tank is a leak in the area of the plastic reservoir. If there are cracks in this area, you may find that coolant has leaked and evaporated. It will cause your engine to overheat as it tries to compensate for the lack of water in its system.
  • Coolant filling or emptying slowly. When your engine is heating up too much. It can cause issues with the regular operation of your cooling system and other components such as brakes or power steering lines. Leading to safety risks while driving! It’s essential not only to check whether or not there are leaks but also to make sure that everything works properly so that no further damage occurs–and if so–how quickly any problems will be addressed before they cause more harm than good. Overheating engines due to low levels of coolant inside them (or none at all). It usually happens when there’s been some problem with the excess draining liquid from within an existing system after replacing parts/repairing damage caused by external sources like accidents etc. A big indicator would be noticing slight discolouration between darker shades on surfaces such as flooring tiles around doors leading outside where temperatures tend to remain highest throughout the day. 
  • Furthermore, heat tends to rise instead downwards towards ground level due gravity effect – thus making areas closest proximity directly underneath sun rays most susceptible during summer months when sunlight intensity reaches maximum strength! While running vehicle types like motorcycles aren’t vulnerable due to being smaller size vehicles altogether

Leaks Or Cracks.

If you have a leak or crack in your cooling system, the first thing to do is check the expansion tank for signs of damage. It can complete by removing the cap and looking inside. If it’s full of coolant and there are no signs of damage on its exterior, then there’s a high chance that your vehicle has been affected by some other problem.

However, if there is any sign of damage, such as cracking or chipping, this may indicate that your expansion tank has damage by debris being thrown up from under the car while driving on uneven roads or hitting large potholes.

It is filling or emptying slowly.

  • The expansion tank will fill slowly if the coolant is not circulating correctly.
  • If the expansion tank is full and coolant has nowhere else to go. It will sit there and eventually boil over into your engine.
  • The expansion tank is a reservoir for coolant and must check regularly.

Overheating Engine

Overheating is one of the most common causes of engine failure. It’s also one of the most straightforward problems to avoid since an overheated vehicle usually displays a warning light on the instrument panel. However, if you don’t heed and continue driving with a high-temperature gauge, it could lead to more severe problems like warped heads or even an engine fire.

Coolant Levels Are Low.

If your coolant levels are low, you must refill them. To do so, you will use a dipstick to check the level of the coolant and add more if needed. The recommended minimum and maximum levels are between 12 mm below and 5 mm above the “MIN” or “Max” lines on the stick. If you can see these lines through your radiator cap, your car’s engine is not overheating due to low fluid levels—your car may have an air leak or head gasket problem instead.

The best way to check whether there is any visible evidence of leaking antifreeze (a white or blue liquid) is by looking underneath or around your car while keeping an eye out for wet spots on the pavement and puddles underneath. vehicles with punctured radiators that contain water from melted ice cubes used during winter months.”

A Faulty Expansion Tank Can Lead To Overheating And, Worse, An Engine Fire.

  • Radiator Overflow Bottles are a vital component of your vehicle’s cooling system, and it’s important to keep an eye on yours. If you don’t have one, or if yours is faulty. The coolant in your car could leak out and cause damage over time.
  • An expansion tank is a reservoir for antifreeze that keeps the engine from overheating by allowing it to expand as it heats up. For example, when the temperature outside gets warmer, or you’re driving at a higher speed. There’s more air pressure inside the engine compartment than outside; this causes the fluid in your radiator—which is hotter than usual. It expands into another container so that it doesn’t overflow into other parts of your car or cause damage to other components like hoses or belts.
  • There are two types of coolant reservoirs: expansion tanks (also called “booster” tanks) and radiator caps (aka “pressure relief valves”). Both serve similar purposes but are different in design. An expansion tank has a small opening where liquid can escape only when needed. At the same time, a radiator cap allows excess fluid to run constantly until complete again. Which means more frequent checking needs doing (especially with older vehicles).


In conclusion, keeping an eye on the coolant expansion tank in your car is essential. A faulty expansion tank can lead to overheating and even an engine fire. If you notice that your car has any of the above signs. It is best to get it checked out immediately by a mechanic so they can replace or repair the faulty coolant expansion tank before further damage occurs. Looking for a Coolant Expansion Tank, don’t waste your time on local places. Contact Parts Factory for high-quality parts. 


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