Quote Originally Posted by Jonathan View Post
Keep the valve closed unless you're actively bleeding air from the system.
Can I ask why? When I installed the air bleeder I was at a tech day with 4 other cars. All of them, besides mine until I installed it, had the bleeder from the thermostat housing to the coolant bottle. None of them had the valve, so theirs would of been open all the time. Just trying to understand it all. Thanks.