Cooling System

There are few things more frustrating than experiencing issues with the cooling system of a Polaris Ranger Mid-Size. Identifying the culprit within the machine’s cooling system can be extremely difficult, and waiting for it to cool down so you can ride again is irritating at best, and completely maddening at worst. There are ways, however, to diagnose and fix problems with the Mid-Size cooling system. Starting with the most basics, always make sure you have enough cooling fluid. Even if you’re right above the minimum threshold when the Ranger rocks or leans in any direction it can disrupt the flow of cooling fluids to the engine and radiator. When stocking up on cooling fluid for your Polaris Ranger Mid-Size, get the green fluid or the red fluid, but never mix colors as they will congeal. Also, take note of the packaging if the fluid is 50/50 pre-mix or not. If so, that's all you need to add. If not, then you’ll have to add the appropriate amount of water for however much fluid you add.

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Whether you have enough cooling fluid in your Ranger or not, you may get air into the coolant lines from time to time. But just because you see a bubble in the coolant line doesn’t mean you have air in there. Furthermore -- and counterintuitively -- it is highly unlikely that a low coolant reservoir is going to introduce air into the coolant system. Polaris Ranger Mid-Sizes are designed to pull coolant into the radiator if the reservoir gets low, and if it catches any air, it will usually push it out. When the cooling system doesn’t push out the air by itself, you can help it out by “burping” the cooling system. To do this, first park your Ranger on an incline raise the front end a foot or two with a jack. Take the radiator cap off and let the Ranger run. Right before the fan cuts on the cooling system will start burping, so watch out lest you get scalded. After the fan cuts on you need to add coolant. Repeat this procedure until you have no burping and the level doesn't drop in the radiator when the fan cuts on.

In addition to getting air into the cooling lines, radiator obstructions can also cause your Mid-Size Ranger to overheat. Winches, light bars, and other accessories can block airflow to the radiator, and mud / dirt can get caked onto it and cause it to underperform. Keep this in mind when considering aftermarket accessories for your Ranger that might block the radiator.

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2023 Ranger Mid-Size SP 570 Cooling System

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