1. Open the hood and inspect the underhood space. When inspecting the engine, pay attention to the presence of coolant in the expansion tank, the integrity of the rubber hoses, radiator..
2. …and water distribution pipe.
Note: A burst hose can be temporarily repaired using adhesive tape.
Note: Reinforced adhesive tape (such as silver) available at auto supply stores works particularly well for this purpose.
3. Inspect the connections to the radiator outlet…
4. …and supply hoses.
5. Inspect the connections of the cooling system hoses to the heater radiator pipes...
6. …and also the lead-in…
7. …and the outlet hoses with the cylinder head.
8. Check the connections of the inlet and outlet hoses to the expansion tank.
Note. There are two valves installed in the expansion tank cap: an inlet valve and an outlet valve. The outlet valve plays a major role in ensuring the optimal engine temperature. It maintains excess pressure in the system of at least 0.12–0.13 MPa (1.2–1.3 kgf/cm²), increasing the boiling point of the coolant and preventing intense vaporization. Unfortunately, when the valve gets stuck in the closed position during overheating, a significant excess of excess pressure occurs - more than 0.2 MPa (2 kgf/cm²), which can lead to a rupture of the expansion tank or a tear in one of the hoses. In turn, jamming of the valve in the open position leads to premature boiling of the coolant.
Note: Therefore, once a year, rinse the expansion tank plug with running water, and check the valve for sticking by pressing with a thin screwdriver. If in doubt, replace the plug.