Fixing Micra K11 part 7 - Cooling system

The mighty Micra didn't want to blow proper heat inside the car. There were no other symptoms and the car didn't overheat or anything, but I suspected that there might be some gremlins in the cooling system... So I filled it with citric acid, let it sit for a couple of months and then flushed the system with water and finally poured in some 50:50 mix of coolant and water. Oh, and in the process the old radiator started to leak (it was badly bent and I tried to straighten it). So I put in a good radiator from a donor vehicle and a brand new expansion tank. Now the car is somewhat ready for the winter, although I'm still not happy with the interior heating... Coolant expansion tank (Polcar 2706ZB-1 / Alvadi.ee # AL30790589) ~19€ Neste Pro Coolant Bio 2 liters ~20€ Distilled water 2 liters ~2€ Total ~41€