The reservoir is just a milky plastic bottle (yes it si the factory one) . I seem to be working just fine
As for the blue stuff dont worry about that I replaced the rad. This was the best shot of the belt routing. But it was some foam I used just to try to block air from going past the shroud before I bought the correct shroud.
2015 Jeep Wrangler JKU "Tank" Sport S
2002 Avalanche: To many mods to list
OK, time to step back and see what's been happening...
You have replaced:
All these parts comprise the entire cooling system, yet you still have a problem.
To continue... you had the head rebuilt, which means that the passages should be clear.
By taking the upper hose off, you verified that the pump is turning in the right direction (water came out the hose and not the radiator, right?).
You have also done other work which may or may not have helped.
So what's left?
Mentioned on page 1, are you sure you put the head gasket on correctly?
Are the heater hoses routed correctly from the heater core to the engine and back?
Is the engine timed correctly?
I can't think of anything else. Anyone want to chime in?
Another thing I forgot to say was what about the heater core itself? It is an integral part of the system and if it is clogged, the coolant can't get through. Maybe you can try to bypass it temporarily to see if it makes any difference. At this point, I would try anything.
The engine bay looks correct. Bypass the heater core by getting a piece of 3/4 tubbing. Remove the hoses from the firewall and join them with the tubing and clamps. Run the engine and post back. If the thing still over heats, I'm with others who have stated the head job is incorrect. The heater core replacement is a PITA but cheaper than redoing the head unless the guy who did the work will stand behind it. I feel for you.