Cooling system should take out air itself.
The cover´s must be Ok.
Sometimes they get old and the system works no more fine.
Open both covers.
Fill the water in the one which is locatet higher.
When water comes out from the deeper one, close it.
Fill water in the upper one till it is full, close it.
Look in the watertank an fill in to high.
Now run the engine and heater.
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