B757 FLT CREW DEPARTS WITH RIGHT AC PACK MEL'ED AND CLIMBING THROUGH 13000 FEET THE LEFT PACK FAILS. FLT CREW IMMEDIATELY GETS CLEARANCE BELOW 10000 FEET AND RETURNS TO DEPARTURE ARPT FOR AN OVER WEIGHT LANDING.

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OVERWT LNDG. WE DEFERRED THE R AC PACK PRIOR TO DEP IN BWI. ON TKOF ROLL; ABOVE 80 KTS; WE RECEIVED A R BLEED CAUTION LIGHT AND CONTINUED THE DEP. ONCE AIRBORNE AND AT A SAFE ALT WE PERFORMED THE APPROPRIATE CHKLIST AND WERE UNABLE TO RECOVER THE R ENG BLEED. THEN CLBING THROUGH 13000 FT I ADJUSTED THE L PACK TEMP CTLR TO A WARMER TEMP; AT THAT TIME THE L PACK OFF LIGHT ILLUMINATED. I SWITCHED THE CTLR BACK TO THE PREVIOUS SETTING AND WE RECOVERED THE PACK MOMENTARILY; THEN WE GOT A L PACK INOP AND PACK OFF LIGHT. WE IMMEDIATELY REQUESTED A DSCNT CLRNC BELOW 10000 FT AND I TOOK OUT MY OXYGEN MASK; CHKED THE CABIN ALT AND IT WAS AT 6000 FT. WE WERE ABLE TO DSND BELOW 10000 FT QUITE RAPIDLY AND CONTINUED DSCNT DOWN TO 4000 FT AS WE ADVISED ATC THAT WE WERE DIVERTING TO IAD. WE RAN THE APPROPRIATE CHKLISTS; INCLUDING THE DIVERSION CHK AND RAN THROUGH THE LNDG OVERWT GUIDE. THE TEMP IN THE CABIN WAS STEADILY INCREASING; CURRENTLY AT 89 DEGS. WE WERE ABOUT 24000 LBS OVERWT AND DECIDED THAT WE COULD NOT CONTINUE CIRCLING FOR ANOTHER COUPLE OF HRS TO BURN OFF THE FUEL. WX WAS FINE AND WE HAD 11500 FT OF RWY AT IAD AND LANDED WITH NO FURTHER INCIDENT.