Polaris ATV Legend
Join Date: Feb 2009
Location: Washington State
When the machine is cold, it should be at that low line, but it's not a big deal right now.
If you have any coolant in there right now, it means your system is completely full.
As your machine gets to operating temp, the coolant expands in volume. Your radiator cap is design to hold a certain amount of pressure in the systems. Usually it's around 14-16 pounds of pressure. I'm sure your heard of caps that have different ratings. Because every cap has a vent or hole in the top, and when that pressure in your system is reached, it pushes the spring and gasket back, allowing the coolant to leave your radiator and flow into that external catch container. If you look at that container after your machine is hot, you'll see it's more full than before you started it. As the machine cools down after being hot, the coolant contracts, and vacuum pressure is created that pulls coolant out of that catch and puts it back into the radiator.
If you fill thy container up when the machine is cold, the next time you ride it, you'll notice it pukeing coolant out because that catch can is too full as it fills even more from the hot expanded coolant from the engine.
Didn't know how much you knew about that, but it's a common question and I'm sure somebody down the road will find that Info useful.
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