Expansion tank: operation, maintenance and price

The expansion tank is part Your car's cooling system: This stores coolant. Therefore, the expansion tank must be filled to equalize the liquid level. If it leaks, you risk overheating. engine and significant damage to your vehicle.

🚗 What is the use of the expansion tank in your car?

There is a reservoir in your cooling system called expansion tank... It is he who contains your coolant... It is also the entry point when you add or change coolant.

But this is not its only function. It also allows for volume variations to be corrected. In fact, when water heats up, it tends to expand. Then its excess flows into the expansion tank. Thus, without the expansion tank, the coolant could spill over and overflow.

In addition, the expansion tank provides pressure constant in your cooling system. The tank pressure is also used to prevent negative pressure in the refrigerant circuit when cooling the liquid.

In other words, the expansion tank plays the role valve to compensate for pressure changes in the cooling circuit.

Finally, the expansion tank has two gradations visible from the outside of the can. They are used to check the correct coolant level, which must be between these MIN and MAX values. If the level is too low, top up.

🔍 How do you know if the expansion tank is defective?

Your expansion tank can gradually fail due to the extreme heat and high pressure it is exposed to. Therefore, it is necessary to check its condition from time to time. We'll explain in detail how to do this!

Required material:

• Toolbox
• Protective gloves

Step 1. Open the hood

To check the condition of the expansion tank, first open the hood of the car and locate the expansion tank. If necessary, you can find this information in your vehicle manufacturer's brochure.

Step 2: Check the condition of the expansion tank.

To check its condition, do not hesitate to inspect the expansion tank regularly. If the coolant boils while the engine is running, it indicates abnormal pressure due to a blockage or coolant leak.

Be careful not to open the lid of the vase. Temperature is very high, beware of burns!

Step 3. Check the condition of the plug.

If you find no leaks, make sure the cover is in good condition and remains sealed. If this is not the case, you will find new expansion tank caps on the market for a few euros!

🔧 How can a leak in the expansion tank be repaired?

If you find a crack or hole in the expansion tank, keep in mind that you can easily plug it, but unfortunately this will only be a temporary repair.

Therefore, we recommend that you replace the expansion tank. Good News: One Piece Costs Less 20 euro... Contact us for a full service (parts and labor) price quote for your vehicle.

👨‍🔧 How to clean the expansion tank of the car?

Didn't find a leak, and the expansion tank needs a little cleaning? It couldn't be easier! After emptying, fill a mixture of water and white vinegar, this will be enough to get rid of the blockage.

Leave it on for a few hours before pouring out the contents, then let it dry well. Finally, don't forget pump the radiator to evacuate air.

Now you know what your car's expansion tank is for. This is not a wearing part: it may have been a leak, but should not be replaced periodically. But remember that if it no longer works correctly, it affects the entire cooling system, causing overheating or even engine failure.