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<h2>What is the function of a car expansion tank?</h2>The expansion tank, also known as the coolant reservoir, is a component of a car's cooling system that serves several functions.An expansion tank provides a place for the coolant to expand as it heats up and pressure builds in the cooling system. This expansion prevents damage to the cooling system and helps maintain proper engine temperature. Besides, it serves as a reservoir for the coolant. As the engine cools down, the coolant contracts and is drawn back into the expansion tank, ensuring that the cooling system is always full of coolant. What's more, the expansion tank allows for easy checking of the coolant level. Most expansion tanks have a maximum and minimum level marked on the side, allowing the driver or mechanic to quickly and easily check the coolant level without having to remove the radiator cap.<h2>How to identify the expansion tank failure?</h2>Expansion tanks are designed to help control the pressure changes in the system as the temperature changes, preventing damage to the system and ensuring proper operation.Then how can you identify expansion tank failure and replace:<ul><li>Look for signs of failure such as water leaks, rust or corrosion, and damage to the tank or the fittings.</li><li>Check the pressure gauge on the system to see if the pressure is fluctuating or if it remains high even when the system is not in use.</li><li>If you tap on the expansion tank and it sounds hollow, this is a sign that the bladder inside the tank has failed and needs to be replaced.</li></ul><h2>How to replace an expansion tank?</h2><ol><li>Turn off the power to the heating or cooling system, and locate the expansion tank. Drain the coolant from the tank and disconnect the hoses from it.</li><li>Install the new expansion tank, making sure that it is the correct size and pressure rating for your system.</li><li>Reconnect the new expansion tank to the system. Refill the system with coolant.</li><li>Finally, take your car for a test drive to ensure that it is working properly.</li></ol>

Expansion Tank

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Air Filter Box

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Mass Air Flow Sensors/Car MAF Sensors | A-Premium

Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

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Flywheel

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Oil Cooler

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Oil Cooler Line

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Oil Filter

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Oil Filter Housing

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Oil Level Sensor

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Oil Pan

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Oil Pump

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Oil Pump Pickup Tube

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

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Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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High Pressure Fuel Pump

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Idle Air Control Valve

Mechanical Fuel Pump

Oil Pressure Relief Valve

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

BMW X5 Expansion Tank