Engine stalls pag nakakabit A/C fuse

Patulong naman po.

2 weeks ago, the a/c suddenly stopped working.. The auto tech said the fan motor is busted..pero habang nag diagnose sya, may nangamoy parang nasunog. So we went to buy fan motor, nung ikabit, pag start indi na one click and worst namamatay na engine. Pag tinanggal ang car aircon fuse sa fusebox, ok n ulit idling ng engine. Pag ibinalik fuse, khit indi pa nka on a/c, hirap mag start. Thanks in advance.