Replacing ALL the hoses, thermostat to fix what the dealer did not do. On ALL the English cars we have there is an AIR breather or on the XJS a 2nd radiator cap to let the air out of the system.
What is the trick to get this FULL?
The Rav is nice BUT the real world is better.

 

any chance you would like to give an idea of what car or truck your working on ?
Year, make, and model,
makes a diagnosis easier

 

Mr. George is most likely wrestling with the Range Rover again, after a bout with a clamp under the coolant jug.

 

You got it, 2001 Range Rover. JUST got it back to the house from the land so will TRY and fix it one last time. This will leave the ONLY piece not changed out as the Water Pump.

 

pull off the hose off the heater core and when fluid starts to come out after running it then put it back on and the air will bleed itself out. Or you could buy an air bleeder. hooks up with shop air and and puts a vacuum on the system. It can tell you their is a leak without putting coolant in it. And it bleeds the vehicle perfectly the first time