Toyota truck no flow in radiator

I have a 1991 toyota truck the fluid in
the radiator dosnt move. I have put
new water pump, fan clutch, took
thermostat OUT. So i replaced water
pump and it is doing the same
identical thing. NOTHING. Burped the
system. Twice! There is vary little
movement of the fluid in radiator. No
water in my oil. No oil in my water.
No water coming out of the exhoust
pipe. It is not losing any water unless
you take cap off when its hot. Ran
water throw every opening lower
hose upper hose top of radiator the
thermostat housing. And yes i have
the heater on high. I am at the end of
road. Whould replace water pump
again but i do not seeing that
helpping