2009 Arctic Cat 250 Utility / DVX 300 ATV Service Manual, Page 77Get this manual

2009 Arctic Cat 250 Utility / DVX 300 ATV Service Manual, Page 77

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CThe thermostat should start to open at 78-82 (172-179 F) and should be full-open at 90 (194 F)DIf the thermostat does not open, it must be replaced3 Inspect all coolant hoses, connections, and clamps