Well, you guys were right, the problem did lie in the Degas bottle. Yes it had spider or stress cracks that you couldnt see untill you pulled it out of the car.
What I ALSO found was a broken siphon tube inside the bottle. When I pulled the bottle out I emptied it and threw it on the ground beside the car and it made a sound indicating that something metal was loose inside the bottle. Upon close inspection I noticed that the nipple in the top of the jug/bottle beside the false nipple the heater bleader loops around is supposed to have a brass tube insude the nipple pressed in that makes a 90* turn inside the bottle and goes straight down. My sipohn tube just fell out loose inside the jug and all that was going to that hose was hot pressured air from inside the Degas bottle instead of the coolant it should be receiving from the bottom. Hope this helps someone in some way.
Also my car is an 03 LS8, I looked up the cooling system info on All Data @ work and found that these cars (the 03 V8's @ least) have a secondary electric water pump. I noticed the sound it made while trying to diagnose the problem and have heard other people mention the sound but no one on this forum ever mentioned anything about it so I just figured I'd mention it.
What I ALSO found was a broken siphon tube inside the bottle. When I pulled the bottle out I emptied it and threw it on the ground beside the car and it made a sound indicating that something metal was loose inside the bottle. Upon close inspection I noticed that the nipple in the top of the jug/bottle beside the false nipple the heater bleader loops around is supposed to have a brass tube insude the nipple pressed in that makes a 90* turn inside the bottle and goes straight down. My sipohn tube just fell out loose inside the jug and all that was going to that hose was hot pressured air from inside the Degas bottle instead of the coolant it should be receiving from the bottom. Hope this helps someone in some way.
Also my car is an 03 LS8, I looked up the cooling system info on All Data @ work and found that these cars (the 03 V8's @ least) have a secondary electric water pump. I noticed the sound it made while trying to diagnose the problem and have heard other people mention the sound but no one on this forum ever mentioned anything about it so I just figured I'd mention it.