Land Rover Discovery 2.5 TDI. 1997. It is heated

It heats up, the cooling liquid does not circulate. Even removing the thermostat ..
the sleeve that leaves the pump and goes to the radiator on the top, when putting the vehicle in motion does not expel liquid.B could it be a pump problem?
Have you told me that I could have the embedded motor cooling circuit?
I have tried to put unfortunately in the circuit, but when the engine is launched, after a while it is heated and expelled by the expansion vessel.

Hello, there is a variation of things that can cause the covered radiator problem, covered heating hoses or heating and damaged water pump.