ACR X CLB TO OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR. ARTCC INTRAFAC COORD. POTENTIAL CONFLICT.

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I WAS RADAR CTLR AT LORAIN SECTOR. I APPROVED A CLB TO FL330 ON ACR X THAT WAS APPROX 10-12 MI FROM ACR Y FL330. BOTH ACFT WERE ON NE COURSES; AND GND SPDS WERE THE SAME (480 KTS). I NOTICED ACR X THAT WAS CLBING TO FL330 WAS DRIFTING OFF COURSE; SO I ASKED THE CTLR WHO WAS WORKING HIM IF THE PLT WAS ON A HDG. THEY SAID HE HAD BEEN ON A VECTOR (WHICH I WAS NOT AWARE OF; AND I SHOULD HAVE BEEN TOLD THIS). I TOLD THE CTLR TO TURN ACR X 20 R SO HE COULD GET BACK ON COURSE. I WAS IN THE PROCESS OF GETTING ACR Y AT FL330 ON THE N SIDE OF ACR X CLBING TO FL330; BECAUSE ACR Y NEEDED TO GO N OF THE ACR X FLT PATH AND ACR X NEEDED TO GO E AND GET ON THE S SIDE OF MY ACR Y. THE CLBING ACR X SPD DROPPED OFF 40-50 KTS WHILE MY ACR Y STAYED THE SAME. SEPARATION WAS LOST SHORTLY AFTER I ASKED ACR X TO EXPEDITE A CLB TO FL350 AND HE INFORMED ME THAT HE COULD NOT DO SO BECAUSE THE PREVIOUS CTLR HAD ASSIGNED HIM MIN CRUISE FOR SPACING TO EWR. I WAS NOT TOLD OF THE REDUCED AIRSPD OR THE VECTOR OFF COURSE. I DID THE BEST I COULD UNDER KNOWN CIRCUMSTANCES. SUPPLEMENTAL INFO FROM ACN 212920: ACR X ISSUED CLB CLRNC TO FL330. HAD BEEN ASSIGNED PRESET HDG. ACR X THEN REDUCED TO MIN CRUISE FOR SPACING. AT NEXT CTLR REQUEST; ACR X TURNED 20 DEGS R. THIS PUT ACR X ON CONVERGING COURSE WITH ACR Y. THE SPD WAS NOT COORDINATED WITH THE NEXT SECTOR. INITIAL OR SUBSEQUENT VECTORS DID NOT SUFFICIENTLY SEPARATE THE 2 ACFT.