NHTSA Complaint #10558341 — 2004 LEXUS RX

I HAVE HAD AN ONGOING ISSUE WITH MY '04 LEXUS RX330. I AM CONCERNED BECAUSE THE ENGINE NEEDLE GOES INTO THE RED ZONE ALMOST IMMEDIATELY UPON DRIVING THE CAR. I HAVE HAD TO FILL UP THE COOLANT TANK EVERY 3 MONTHS. THE PROBLEM WAS JUST DIAGNOSED AS A CRACK IN THE RADIATOR. I FOUND A TSB FOR THIS ISSUE BUT AM THE 2ND OWNER AND WAS NEVER NOTIFIED. IT APPEARS THAT I AM OUT OF THE COVERAGE PERIOD. IS THERE CAUSE FOR CONCERN THAT THIS ISSUE COULD LEAD TO FURTHER DAMAGE TO THE CAR OR A SUDDEN DRIVING IMPAIRMENT? DOES A TSB = A RECALL? LEXUS HAS TOLD ME THAT THERE IS NOTHING THEY CAN DO FOR ME. *TR