Additional thought on the coolant level issue and the molded arrow on the tank. I wonder if the original design included the rather high operating temperatures we've seen reported? i.e. the higher the coolant temperature, the more expansion volume needed in the surge tank.
Although I have read reports of rather high operating temp, it really isn't that high for a coolant mix under pressure.....just a bit more than is often seen on other vehicles.
I suspect this is why the Cruze utilizes a 20 psi pressure cap rather than the more commonly found 16/18 psi relief design.
But again, a ten degree increase in operating temp would not likely even be visable from a expansion viewpoint.
Regarding operating temperature......I do not know where on the head the sending unit (not sensor) is located and it must be remembered that the temperature being reported is at that mounting point and is not necessarily the actual temperature.
For example, small block Chevy V-8's generally have the sender located on the outside of the left cylinder head casting......between two exaust ports..arguably one of the hottest points in the entire cooling system.
If you were to install the sender in the crossover water passage in the intake manifold, just beside the thermostat, you will find the coolant to be 10 to 15 degrees cooler.......so, begs the question: What temperature is it operating at?
Eventually the answer I settle on is 'Who cares as long as it is within its design parameters'........that being it is not overheating, temp lights aren't being triggered and the gauge is where it should be....somewhere between 3/8's to 6/8's needle travel.......if it gets higher I look into it, otherwise I refuse to cause myself brain damage worrying about something that is of no concern.
Rob
