Coolant Expansion Tank

Expansion tank is a part of cooling system. For modern cars is used a system of cooling that works with antifreeze. This antifreeze expands when temperature rises. As cooling liquid circulation is a closed process, expansion tank is made as an additional tank. When cooling liquid gets cold it flows into the system of cooling liquid circulation. The expansion tank usually is situated at the top of the under hood space, so it is easy to find it. 

Because of nonhermetic closing of the tank, antifreeze can flow out. If it happens so, you need to find the hole. Sometimes it is difficult to find the hole if it is very small. When the engine is cold pressure is not high enough, but when it warms, antifreeze flows out. The small hole may be packed. When it is big, it is necessary to change the whole expansion tank. It isn’t difficult to change it, but before you start, you need to pour off some of cooling liquid.

After you nest a new expansion tank fill it up with new antifreeze. You need to pay attention to the car manufacturer service instruction. Before you install the new tank follow it step-by-step. First, make sure if the expansion tank is the reason of breakdown. In the cooling liquid circulation system a hole can appear in many places. You also have possibility to order other parts for your car. If you need the following parts to repair the car: independent suspension joint, turbo-charger, wiper, gear, absorber or nozzle for washer, you can easily find them in our online shop.

HOW TO DETECT A FAULT OF THE COOLANT EXPANSION TANK

The cap and valves of the component are to be tested every 4 months. Start with checking correctness of the component location, then proceed to valve diagnostics. The component should be checked for defects and rust. To check that the valve is functioning correctly, apply pressure to it. The symptom of good order will be the distinctive whistling when the valve is pressed in, and the sucking sound when the valve is released. Next, inspect the plug of the component. Make sure it has no deposits and rust. Check pressure. The pressure value can vary between 80 and 120 kPa. Inspect the housing of the component. It should not have traces of leakage. They are the symptoms of cracked surface.