Surely you don’t call that tea try using a teapot ,loose tea rolling boiled waterOh that Alex! I accidentally bumped into her Youtube channel last week. I liked her "Roveralls", I wouldn't buy them second hand from her mind!!
Maybe you could message her there.
It is normal to have a combination of screws and pop rivets. They were assembled in the factory this way. The reasoning for the placement of the different fasteners is a mystery and discussed elsewhere on the forum.I have now remove the heater, it is in a good condition, but needs overhaul because foam is bad and scrumble.
I did see that the box has screws but also pop rivets, I need to drill out otherwise I can not reach nothing. I think
this is not original, as (I have the latest production car from Belgium maybe screws are running out and did use this
pop rivets.
Check that where the inputs from the interior move arms (pic2) the shafts are not slipping in the arms - this happened on mine and meant that the input flap did not open.
Check your local hardware shop for foam with adhesive backing - I found quite cheap roll, ~6mm thick. Worked on the flaps well. Take pics as you dismantle. There is some on my heater here P6B S Project Car, and many other threads. Take a pic (like pic2) with the heater positioned as it is in the car - its easy to get the levers and rods in the wrong orientation, makes life very difficult.