My 06 DTS is still getting hot. This time it's on the highway after about 10 minutes. It cools down immediately when I exit the highway and the fans come on.
I changed the water pump and all gaskets myself. Changed thermostat and the water pump belt with the tensioner. I have enough coolant.
There is good flow from the purge line. After I turned the car off I could hear a hissing noise from the radiator cap.
Do you think the cap is bad? Letting air in to the system somehow? Maybe the thermostat isn't good?
I changed the water pump and all gaskets myself. Changed thermostat and the water pump belt with the tensioner. I have enough coolant.
There is good flow from the purge line. After I turned the car off I could hear a hissing noise from the radiator cap.
Do you think the cap is bad? Letting air in to the system somehow? Maybe the thermostat isn't good?