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Try checking the heater control valve. Follow the heater hose from the engine, and as you get closer to the firewall, you should run into it. It is in line with the hose, and should have a vacuum hose connected to it. Apply vacuum to the valve and it should move. If not, then replace the valve. If there is no vacuum when engine running and heater turned on, then check the hose for leaks or the vacuum source.
Pressure test the cooling system. Remove the spark plugs and inspect the top of the piston. Look for coolant. If you can see your own eye you found coolant. If the cooling system was properly bled and still no heat at idle you may find coolant in the cylinder. The head gasket would need to be replaced and the surfaces prepped. Machining the head is not recommended.