A CL65 ON LEVELOFF AT FL310 DECLARED AN EMER AND DIVERTED DUE TO L PFD WENT BLANK. SMOKE IN COCKPIT AND L PACK OVERTEMP TRIP.

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LEVELING OFF AT FL310 WE HAD FLT DISPLAY FAILURE. THIS WAS FOLLOWED BY SMOKE IN THE COCKPIT AND A L PACK OVERTEMP. DUE TO THE SMOKE IN THE COCKPIT AND 2 SYS MALFUNCTIONS; WE DECLARED AN EMER AND DIVERTED INTO ZZZ. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED ON LEVELOFF AT FL310 THE CAPT'S PFD WENT BLANK FOLLOWED BY LIGHT SMOKE. WITH THE CREW'S ATTN FOCUSED ON THE FAILED INSTRUMENTATION AND SMOKE; THE L PACK TRIPPED OFF WITH 'OVERTEMP' INDICATION. WHEN THE RPTR WAS ASKED IF THE PACK WAS OPERATING IN AUTO MODE; THE RPTR SAID 'NO IT WAS IN MANUAL; THE AUTO MODE ON THIS AIRPLANE NEVER WORKS AND IS ALWAYS OPERATED IN MANUAL.' ON THE GND; MAINT ATTEMPTED TO REPLACE THE PFD; BUT HAD NONE IN STOCK SO THE REMOVED UNIT WAS REINSTALLED AND OPERATED NORMALLY. THE CAUSE OF THE SMOKE WAS BELIEVED TO HAVE COME FROM THE L PACK WHICH WAS THEN DEFERRED. THE AIRPLANE WAS ROUTED ON A MAINT FERRY TO A MAINT FACILITY. THE RPTR HAS NO INFO ON THE MAINT ACTION TAKEN AND THE COMPONENT THAT FAILED.