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

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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