Note that all of them do not have the same interior. There is a slight difference here. Blue red Pullman cars are products of the first trials of TCDD to operate luxury cars. They were introduced with Fatih Express between Ankara-Istanbul. They have relatively higher quality interior than other Pullman cars.
Blowers do the heating.
Before TVS2000 s they were being operated as the special cars of Fatih Express. Now they lost their importance. Today, they are in mixed operation with other Pullman stock, and some have even no different interior than the other Pullman stock. Today it is a night train and it is equipped with TVS2000 stock. The blue-red Pullman coach in Anadolu Express to Ankara.