A B757-200 IN CRUISE AT FL370 DIVERTED DUE TO HOT OR BURNING ELECTRICAL ODOR. 2 EICAS WARNINGS 'EQUIP COOLING FAN' AND 'EQUIP OVERHEAT.' CAUSED BY THE EQUIP COOLING FAN BEARING FAILURE.

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DURING CRUISE FLT WE EXPERIENCED A HOT OR BURNING ELECTRICAL ODOR IN THE COCKPIT. I CALLED THE PURSER AND ASKED IF SHE HAD THE ELECTRICAL ODOR; IF ANYONE WAS IN THE LAVATORY; OVENS ON; COFFEEMAKER PROBS; ETC. SHE HAD THE ODOR THROUGHOUT THE CABIN AS IT TRAVELED TOWARDS THE OUTFLOW VALVES; BUT THERE WAS NO APPARENT REASON IN THE CABIN FOR THE SOURCE OF THE ODOR; THE ODOR INCREASED FROM LIGHT TO STRONG AND I TURNED OFF THE UTILITY BUSES AND THE R RECIRCULATION FAN WAS SHED. THE ODOR DISSIPATED IN THE COCKPIT AND THROUGHOUT THE CABIN. WE LOOKED THROUGH THE CHKLISTS AND ONLY THE SMOKE/FUME REMOVAL APPLIED; SO WE TURNED OFF BOTH RECIRCULATION FANS. AFTER WE DISCUSSED OPTIONS AND INFORMED ATC AND DISPATCH OF A POSSIBLE DIVERT; THE ODOR WAS GONE AND I DECIDED TO PRESS ON TO JFK. WITHIN A FEW MINS THE ELECTRICAL ODOR RETURNED; ALTHOUGH NOT VERY STRONG. SO MCJ WAS CLOSEST; I DECIDED TO MAKE A PRECAUTIONARY LNDG WITHOUT ATTEMPTING TO TROUBLESHOOT THE PROB FURTHER. ON TAXI IN; WE HAD 2 EICAS MESSAGES; EQUIP COOING FAN; AND EQUIP OVERHEAT. I TURNED THE L RECIRCULATION BACK ON AND THE EQUIP OVERHEAT EXTINGUISHED. MAINT CONFIRMED THE EQUIP COOLING FAN HAD FAILED; WE HAD TO WAIT FOR PARTS TO BE FLOWN IN. MAINT SAID THE FAN BLADES WOULD TURN WITH ONE ATTEMPT AND LOCKUP WITH THE NEXT TRY; THE BEARINGS WERE SHOT. WE FERRIED THE REPAIRED ACFT TO JFK THAT AFTERNOON.