Auto fan switch wire was broken and some electrician bypass it by joining the two wires together, also added a relay for some reason and a rectifier like we have in our 70cc bikes (He maybe a scientist
Don't know). Power was also drawn by coil's +ve terminal.
By correcting all the mess did by electrician, my car fan is now working auto again Alhamdulillah. Other than this wiring harness is not butchered and in very good shape like as came from factory.