Heating system flush
 

It was worth it, i highly reccomend :D

https://i.imgur.com/LsCezsQ.jpg
https://i.imgur.com/NkF9A3G.png
https://i.imgur.com/arLvk6Q.png
https://i.imgur.com/J55mEmn.png
https://i.imgur.com/AN9c8Vz.png

I also replaced the heating valve block/motor
If someone plans on doing this, it took me about 9h start to finish with no breaks.

Result = I now have a car with working heat and AC +++

Did you follow the manual? Any tips / handy hints along the way?

One tip I can give is to start flushing with a very low pressure and wait for water to start coming out the other end, once it starts coming out then you can safely increase it.

Also you will find quite a few corroded connectors in the ECU box so have contact cleaner ready.

Also this diagram is useful:

https://i.imgur.com/iagnNgE.png

I flushed each heater core in 2 directions as well.