AN ACR DC8 FREIGHTER FLC HAD AN NMAC WITH AN UNKNOWN ACFT WHILE BEING VECTORED BY APCH CTL AFTER A GAR. THE CTLR WAS NOT IN RADIO CONTACT WITH THE INTRUDER.

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ON AN APCH DOWN TO MINIMA; BECAUSE OF A BAD RADAR VECTOR; WE WERE UNABLE TO GET ESTABLISHED ON THE APCH AND ELECTED TO GAR (ILS RWY 4R JFK). WE CLBED TO 500 FT THEN CLBING R TURN TO A HDG OF 100 DEGS. AS TURN WAS INITIATED; SHORTLY AFTER; WE WERE CLRED TO CLB TO 4000 FT THEN APCH TOLD US TO LEVEL AT 3000 FT. WE WERE ALREADY AT 3300 FT. THEN A L TURN 360 DEGS; THEN A R TURN 060 DEGS. RIGHT THEN; WE SPOTTED AN ACFT WITH WING LIGHT VERY CLOSE AND WE ALTERED HDG AND ALT TO AVOID. WE TOLD APCH AND THEY SAID THEY DID NOT KNOW WHAT HE WAS DOING THERE AND THAT THEY WERE NOT TALKING TO HIM. WE NEED TCASII IN ALL ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS THE SO OF A DC8-73 FLC THAT HAD A CLOSE ENCOUNTER WITH ANOTHER ACFT WHILE BEING VECTORED BY AN APCH CTLR AFTER A GAR. HE SAID THAT HE LOOKED OUT OF THE CAPT'S L SIDE WINDOW AND SAW THE WINGTIP LIGHT OF ANOTHER ACFT THAT WAS FLYING APPROX PARALLEL TO THEIR COURSE. THE FO ASKED ABOUT THIS ACFT AS THE CAPT WAS TAKING EVASIVE ACTION. THE CTLR ALLEGEDLY TOLD THE FLC THAT HE DID NOT KNOW WHAT THE ACFT WAS DOING THERE AND THAT HE WAS NOT TALKING TO HIM. HE SAID THAT THEY WERE SWITCHED TO ANOTHER FREQ AND SUCCESSFULLY COMPLETED THE NEXT APCH. THEY NEVER LEARNED OF THE OTHER ACFT'S TYPE OR IDENT. THE FLC LATER ESTIMATED THE OTHER ACFT TO BE APPROX 200 FT FROM THEM HORIZLY AND AT THEIR ALT.