I understand that when the car is hot there should be pressure in the cooling system and hence the air would come out when opening the coolant valve. My question is whether the system is always under pressure.? I try letting the car idle for two weeks and the systen is still pressurelized.
If the system always have pressure does this mean as long as the system is presiirelized there would be no leak?
2001 S Tip with 100K KM
Thx