It sort of worked but only luke warm air but the water pump was basically goosed so thought replacing that and a system flush would do the trick. Didn't change the Thermostat as thought it would be ok...would it be stuck open?

Edit:it's an M44 engine and I didn't physically remove the thermo to test it no. Could that be the fault. Checked the coolant levels again this morning and it barely moved so don't think there is any more air trapped.

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