MD SUPER 80 FLC WERE GIVEN VECTORS FOR ANOTHER APCH AFTER APCH CTLR TURNED THEM LATE ON THE LOC CAUSING CONFLICT WITH ANOTHER ACFT TURNING ONTO THE LOC FROM THE OPPOSITE DIRECTION.

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FLT ABC FROM ORD TO PHL. ON VECTORS TO THE FINAL APCH FOR RWY 27R AT THE PHL ARPT; WE HAD WHAT APPEARED TO BE A TFC CONFLICT. WE WERE TURNED TO BASE FROM THE N ON THE APCH FOR THE INTERCEPT OF THE LOC COURSE. THE CTLR GAVE US A TURN TO 270 DEGS TO SLIGHTLY PASS THROUGH THE LOC AND THEN COME BACK FROM THE S TO INTERCEPT. HE ALSO TOLD US TO DSND FROM 3000 FT TO 2000 FT. WHILE IN THE TURN AND DSCNT; THERE WAS A BLOCKED XMISSION ON THE FREQ. WE TOLD THIS TO THE CTLR AND HE THEN GAVE US A TURN TO 290 DEGS AND THE DSCNT TO 2000 FT. WHILE THIS WAS ALL HAPPENING; WE GOT A TCASII ADVISORY ON AN ACFT S OF OUR POS (NEVER CALLED TO US BY THE CTLR) WHO LOOKED TO BE ON THE DOWNWIND FROM THE S SIDE FOR RWY 27R. WE WERE CONCERNED ABOUT HIS POS AND WE WERE MONITORING HIS TRACK. WE NEVER GOT AN ALERT; BUT HE MUST HAVE BECAUSE HE SAID HE WAS RESPONDING TO A TCASII ALERT. THE CTLR ALSO CALLED US AT THIS TIME AND SAID THAT WE WERE 2600 FT AND COULD WE SEE THE RWY AND COULD WE COMPLETE THE APCH VISUALLY AND LAND. THE CONDITIONS WOULD NOT ALLOW THIS COURSE OF ACTION NOR COULD WE SEE THE RWY. WE WERE ALSO STILL TRYING TO VERIFY THE POS OF THE OTHER ACFT THAT WE NEVER DID SEE. WHEN WE DIDN'T REPLY IMMEDIATELY; THE CTLR TOLD US THAT HE WOULD VECTOR US FOR ANOTHER APCH. HE CLBED US BACK TO 3000 FT AND GAVE US HDG BACK AROUND FOR ANOTHER APCH WHICH WAS COMPLETED UNEVENTFULLY. NO NMAC WAS DECLARED. WE WERE; ACCORDING TO OUR TCASII; ALWAYS WITH ENOUGH SEPARATION; BUT IT WAS A VERY DISCONCERTING APCH -- ESPECIALLY WITH THE EXTREMELY HAZY CONDITIONS THAT WE WERE IN.