Logic behind filling the radiator ,car's front face up, to give air bit of room out while process of pouring the water inside . @abid110 , your car's over flow pipe is too short ,it should have been at least 1 1/2 feet long. There is a hole just underneath the plastic reservoir to pass this pipe downwards .Because of short of length ,it is pouring overflown water on the harnesses of radiator fan and head beams, you have covered them with a shopper bag and taped, thus causing the electric component disorders .It might has kept disconnecting your radiator fan due to short circuit . Once fan is off when needed ,may cause your pocket a big dent ,on the other hand short circuit may burst into fire . First correct your wiring and remove shopper bags .
Secondly ,your car's radiator along with reservoir are too much gunky inside ,Those needs a proper wash or replacement .And this should be done urgently .