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Replace a Spare part Coolant Expansion Tank (Coolant Tank) – a defective one or if the limit of use has been already reached. Find out useful information about Coolant Expansion Tank (Coolant Tank)

Expansion tank is a device involved in the process of engine cooling. It became widespread after motorists began to use antifreeze fluids such as cooling fluid and antifreeze. Their base is diatomic alcohol. Its thermal expansion coefficient is much bigger than that of water. Thus, when the engine heats, the liquid poured into the cooling system under the "neck" of the tank radiator, starts to expand and displace through the relief valve radiator cap.

When the engine turned off cools down, the volume of the liquid is reduced and the cooling system starts depression. At the same time the valve cover turns on and the radiator pulls air. When the engine will operate this will cause the accumulation of air pockets in the cooling jacket and disrupts the process of heat removal. In order air not to get inside instead of the liquid, additional capacity is required. So, the expansion tank is indispensable here. With the help of the tank the hose is connected to the neck of the radiator and positioned so that its middle part is at the edge of the radiator.

Excess of fluid heated is pressed out into the tank, and again during the cooling of the engine fills the system, excluding entering of air there. Due to installation of the expansion tank, environmental problems were solved. When designing streamlined vehicles, the tank and the radiator neck prevented “sharpening" of the front of the car. In this case radiator was turned and lengthened to the maximum permissible value. The coolant in the system began to circulate from right to left or vice versa, rather than top down, so to control its level is now possible only through the expansion tank. Do not waste time in vain to find the expansion tank for your car, order it in our online store. Also here you will find such products as a pendulum support, thermostat and wishbone.

Coolant Expansion Tank (Coolant Tank) for VOLVO 850 Estate (LW), VW GOLF II (19E, 1G1), FORD GALAXY (WA6)

Faults of expansion tank
  • dribbling of the expansion tank;
  • failure of the tank cap;
  • leakage of the tank;
  • failure of the valve;
  • failure of the connecting hose.
Symptoms of expansion tank failure
  • engine overheating;
  • the antifreeze squeezing out of the expansion tank;
  • air locks;
  • increased evaporation;
  • excessive consumption of antifreeze;
  • swelling of the body;
  • temperature decrease of antifreeze boiling;
  • tank overflow while driving;
  • loosening of pipe clamps;
  • leaking radiator.
Causes of expansion tank faults
  • impact of temperature;
  • clogging or corrosion of the tank cap;
  • blockage of the valve;
  • Improper placement of the tank in relation to the radiator;
  • too high pressure;
  • low quality plastic;
  • poor quality of the coolant;
  • insufficient anti-freeze level;
  • damage to the body tank.

Diagnosis of valves and a tank cap should be performed every 4 months. Check whether the tank is placed correctly: the radiator top should coincide with the middle of the expansion tank. Then you need to check the serviceability of valves. To do this, perform a visual inspection for damage and corrosion. To test the functionality press the valve with your finger. If the item is operable, then you will hear a characteristic whistling, and when released it will produce a sucking sound. Inspect the expansion tank cap. There should be no deposits or corrosion. Check the pressure: minimum value is 80 kPa, and the maximum is 120 kPa. Inspect the tank body. The presence of streaks indicates cracks.

Repair of expansion tank

Repair of the tank is carried out only for minor faults. The first step is to clean a clogged cap and valves. When the cap gasket is worn, a new one can be installed on top of it, but it is a temporary measure, and therefore the cap needs to be replaced soon. The cap should also be replaced in case of corrosion, destruction of valves. Small cracks on the tank body can be soldered with a soldering tool, or you can use a special gun for plastic soldering, followed by reinforcement.

Replacing expansion tank

The average lifespan is 3 years. In case of leakage, severe damages, dribbling in several places it is necessary to replace the tank. This would require such tools: a set of wrenches, a screwdriver, hoses, pliers, files. With the help of a file clean the burrs from the hose attachment spot. Remove the adsorber, and then drain the coolant. Remove the old tank, install a hose to remove fumes on the new one. Connect the pipes and tighten the clamps. Pour new antifreeze.

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