Quote Originally Posted by SubGothius View Post
I gather if the radiator cap or coolant recovery bottle are the highest point in the cooling system, any air in the system eventually migrates and collects there and doesn't need to be bled, so it's only when some other part of the cooling system is the highest point, such as the head, that you need some way to bleed air from that point. Since our trucks have the rad cap as the highest point, they don't need air bled out.

P.S. I noticed in your photo the ground wire from the firewall to the head is disconnected, in case you weren't aware. You'll wanna reconnect or replace that. A generic braided ground strap from an auto parts chain store worked fine for me, albeit a bit long, so I attached it to an intake manifold stud instead of an exhaust stud, which was easier to unscrew and took up much of the extra slack.
Thanks for letting me know about the ground strap. Do you know what that does? I didn't think much of it so I left it disconnected. Didn't look like it powered anything.