Alhamdulillah performed DIY service of my santro ac evaporator without dismantling. Sprayed water mist on evaporator from openings in Flap ( inside / outside air select) and used Flamingo AC pro cleaner from Air vents side.
Now AC is unexpectedly chilling like a freezer even in stationary car in scorching sunlight Alhamdulillah.
Also cleaning of evaporator is putting very less load on engine and it's giving exceptional mileage on CNG with AC.