2007 LEXUS LS 460 Engine And Engine Cooling Problems

I JUST RECEIVED A RECALL NOTICE--"VALVE SPRING REPLACEMENT SAFETY RECALL NOTICE" FROM LEXUS. I CALLED MY DEALER AND WAS TOLD THE FIRST AVAILABLE APPOINTMENT FOR THIS RECALL WAS IN ONE YEAR--NOV. 2011. I FEEL THAT IF A RECALL IS WARRANTED, I SHOULD NOT HAVE TO WAIT ONE YEAR TO HAVE IT DONE.

I ARRIVED HOME AFTER DINNER, DROVE MY 2007 LEXUS LS460 (EQUIPPED WITH KEYLESS IGNITION) INTO MY ATTACHED GARAGE, CLOSED THE GARAGE DOOR AND, LEAVING THE KEY FOB INSIDE THE VEHICLE, I ENTERED MY HOME AND EVENTUALLY WENT TO SLEEP. I WAS AWOKEN AT APPROX. 2:15AM BY A CARBON MONOXIDE ALARM LOCATED IN THE FOYER INSIDE MY HOME ADJACENT TO THE ENTRANCE TO THE GARAGE. I ENTERED THE GARAGE TO DISCOVER THAT THE CAR'S ENGINE WAS STILL RUNNING, THE GARAGE FILLED WITH NOXIOUS FUMES, AND THE ENTIRE VEHICLE EXTREMELY HOT TO TOUCH, INSIDE AND OUT. I OPENED THE GARAGE DOOR AND WAS EVENTUALLY ABLE TO SHUT DOWN THE ENGINE AND CLEAR OUT THE FUMES. AS I SEE IT, THE FAILURE HERE WAS TWO-FOLD: (1) WHEN I OPENED MY DOOR TO EXIT THE CAR, NO ALARM OR OTHER SOUND ALERTED ME THAT THE ENGINE WAS STILL RUNNING, AS IS THE CASE WITH...