The expansion tank cap is important for the coolant circulation system, maintaining the necessary pressure for the system through the valves installed on it. If the pressure in the system rises above 1.2-1.5 bar, then the outlet pressure reducing valve opens, through which the excess of the formed steam escapes. As the coolant cools, it contracts, creating a vacuum in the system. In order to remove the reduced pressure in the system, a second valve is installed on the cover - inlet. It opens when the pressure in the system drops to 0.06-0.1 bar, letting in atmospheric air.
To check the exhaust valve, use a device with a pump that allows you to create the necessary pressure. A properly functioning outlet valve on the cap should open at a pressure of 1.2-1.5 bar.
Checking the performance of the intake valve is carried out as follows:
1. Remove the cap from the expansion tank.
2. Pinch the thick coolant hose.
3. Replace the cover and tighten it.
4. Release the hose. If the hose does not remain in a compressed position, takes its original shape, then the inlet valve should be in good condition.
Flat coolant hoses observed in the morning indicate a malfunction of the intake valve on the cap of the expansion tank.
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