Just replaced the radiator and thermostat on 2000 ls v8. The car keeps running hot and we got this code.....
we used a handheld scanner and it gave us p1299 -manfacurer fuel air metering. I see that is incorrect now...
My radiator had cracked, front bumper was covered in coolant..last friday. After we replaced that , the car continued to run hot, so next we replaced the thermostat. It was bad also. The motor did run hot prior. Now it just says the engine is overheating but yet it is not hot.
how did you come to the original diagnosis that it was the thermostat and radiator? Could be you have a bad cooling fan actuator which causes over heating and can lead to other cooling system problems.