Cars with petrol engines
- Overpressure valve - opens at 81.4-108 kPa
- Vacuum valve spring; the vacuum valve opens at a vacuum of minus 6.86 kPa
Vehicles with diesel engines
- Overpressure valve - opens at a pressure of 107.9±14.7 kPa
- Overpressure valve - closes at 83.4 kPa
Examination
1. Check up absence of damages of a spring and interfaced surfaces of the valve.
2. Attach the radiator cap to the radiator cap tester.
3. Apply pressure until the pointer needle stabilizes.
4. After 10 seconds, check the pressure, which should not change. If necessary, replace the radiator cap.