Pressure in cooling System

[pberku]

I had a thermostat leak fixed this week, and am now monitoring my coolant level very closely to make sure that I have no further leaks. The engine never overheated.

I now notice that when I release the overflow coolant cap, even after 12 hours of not having used the car there is still pressure being released. I am assuming that I did not notice this pressure before because of the original leak.

Is it normal however for the pressure to remain in the cooling system for 12 Hours or more? I should add that the hoses themselves are not under pressure when the engine is cold.

I am assuming that this is a good sign. Is that right?


Thanks,

Phillip