Help needed please?

Hi i'm new to this site and i'm having problems with my land rover disco II td5 i've been working on the cooling system and now can't clear the air lock from the heater matrix. I've done the removing the expansion hose from radiator and lifting the expansion tank but it still wont clear. Any ideas please?

park it nose up on the steepest slope and change the bleed valves for Domestic radiator bleed valves, so they can be cracked open under pressure.

are there any bleed valves on the heater matrix? i can see where the bleed valve is on the top radiator hose.