Location of elements of the engine cooling system
1. Radiator; 2. Refrigerator air conditioning system; 3. Cooling fans; 4. Water pump; 5. Thermostat; 6. Expansion tank
Thermostat
1. Flange; 2. Piston; 3. Valve; 4. Main spring; 5. Additional spring; 6. Foundation; 7. Valve; 8. Valve seat
Hydrometer
You can use a hydrometer to check the condition of the coolant.