No heat/ overheat on accasion

[bcv067]

Here is the back story. 2000 LS 3.9. Bought as a basket case. Missing everything on front of motor. Problem now is no heat after bleeding and it will run half way on the temputature gauge for a week and then overheat!
I dont think the hoses are on wrong at the control valve. One is marked with green on hose and coupler. At the control valve the two little lines are hot and the larger one is not. Please any help or advice will be appreciated.

 

[LS4me]

Slow leak in the system. When was the degas bottle replaced?

 

[bcv067]

I think that is the overheat issue. How do you test the DCCV? i only have one power wire( red) at the plug.

 

[2000sport]

For what it's worth, mine did the same thing after replacing my degas tank.

Turned out I still had a pocket of air in the system after bleeding.

Just keep bleeding it.

 

[bcv067]

Fixed it. Since the car was apart a long period, I had to bleed the system 4 times to get all the air out!!!!!!!!!!!!!!!!!!!