I have just done this on mine after fixing a leak. yours is a simple one, you have an airlock. run the car till warm, remove the water filler, leave about 2" from the top and leave it running. eventually the air will come out. make sure you have the heating set onto hot front and back
No heat in front but the rear heat works great.
i have the same problem went and bought a blend door actuator and replaced it did not solve problem did you have a clicking noise before the heat stopped.
what where is the water filter ?
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