My parents have a 96 duratec sable wagon where the temp needle usually would go up about 3/4 of the way and sometimes within an 1/8" of the hot mark. I performed a Prestone chemical flush with no results. The heater blows hot, hoses seem ok, and both fans come on and stay on when they should. Also, I have changed the water pump and thermostat in the last couple years.
I just got done replacing the motor due to broken valve spring and dropped valve that shattered the piston and tore a hole through the block. I swapped the newer water pump onto the donor, but used the sensors that came on the donor motor. Temperatures on the gauge remain the same. So, I went ahead put in a new radiator. Old one was pretty dirty so was probably not as efficient as it should be, however, the temps are still almost the same.
Oh, at one point I also put it on a scan tool and verified the ecm was seeing temps same as the gauge...around 235 deg
Good news is donor motor runs great. The only thing left is that it is throwing a code for an oxygen sensor (bank 1, sensor 2)...I have to figure out which one that is. Could that be what is causing the temps to run high?
Is there an air bleed procedure that I don't know about?
What else could it be???
Thanks for your replies.