Here's the deal my wifes legacy outback temp would go up and down I changed the therostat, it didn't help. I changed the coolent temp sensor no help. I have bled the air out of the cooling system no good, changed the water pump, while in there new timing belt. It runs great but going up hill under a load it overheats. put it in neutral bring up rpm's a little it cools down. I have also flushed the system.