I have been trying to do some research on this topic and cant really find technical information. I understand how they open and close and why they are there. My question is, when do they open and close? All I know is that they are closed in the cold mornings to promote faster warm up. Once the fluids are hot, do they open to cool, then close again? Do they just partially open, or is it all or nothing?
Thanks for any information you may have.
Thanks for any information you may have.