10-13-2020, 05:42 AM
Jeff,
On my C12 the temperature stays at 186 for most of my driving. However, if I get stuck in traffic on a hot day, the temps will rise up to about 205 but then start dropping once the fan cuts on. In other words the 20 degree range of coolant temps are perfectly normal.
So....do you see the 20 degree swing when the engine is not under load?
Have you verified that you have enough water/coolant in the radiator (from the filler cap not the overflow tank)?
Have you dipped out some of the coolant and looked at it? I have heard that if you mix different incompatible kinds of coolant, you can cause a sediment to form that can be suspended in the liquid. I believe it would show up as a cloudy sludge in the coolant.
How clean is your radiator / CAC? If you open both side bays of the engine you should see light through the rad. If not, there are a couple of threads on here about cleaning your radiator....but be careful of Simple Green. It reacts with aluminum. They say the Simple Green Extreme is safe for radiators.
From what you wrote...the 165 on the low end sounds strange....too low. That would point to a thermostat that is stuck open. If the temp is moving around a lot when engine is not under load, I would suspect a temperature sensor...but to be honest I have no idea where mine is. (You might want to drop into a cat dealer and get them to look at thermostat(s) and do a fluid analysis. (They can do coolant AND oil)...that might tell you something.
bill
On my C12 the temperature stays at 186 for most of my driving. However, if I get stuck in traffic on a hot day, the temps will rise up to about 205 but then start dropping once the fan cuts on. In other words the 20 degree range of coolant temps are perfectly normal.
So....do you see the 20 degree swing when the engine is not under load?
Have you verified that you have enough water/coolant in the radiator (from the filler cap not the overflow tank)?
Have you dipped out some of the coolant and looked at it? I have heard that if you mix different incompatible kinds of coolant, you can cause a sediment to form that can be suspended in the liquid. I believe it would show up as a cloudy sludge in the coolant.
How clean is your radiator / CAC? If you open both side bays of the engine you should see light through the rad. If not, there are a couple of threads on here about cleaning your radiator....but be careful of Simple Green. It reacts with aluminum. They say the Simple Green Extreme is safe for radiators.
From what you wrote...the 165 on the low end sounds strange....too low. That would point to a thermostat that is stuck open. If the temp is moving around a lot when engine is not under load, I would suspect a temperature sensor...but to be honest I have no idea where mine is. (You might want to drop into a cat dealer and get them to look at thermostat(s) and do a fluid analysis. (They can do coolant AND oil)...that might tell you something.
bill
Bill Johnson
Birmingham, Alabama