1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 314Get this manual
CHAPTER ELEVEN
Figure for typical diagramDuring operation
the coolant heats and expands, thus pressurizing the systemCooling system flushing procedures are provided in Chapter ThreeWARNING Do not remove the filler cap (Figure 9) when the engine is hotThe coolant is very hot and is under pressureSevere scalding could result if the coolant comes in contact with your skinThe cooling system must cool prior to removing any component from the system
thermostat reduces coolant flow from the engine when it is coldAs the engine warms up, the thermostat gradually opens, allowing coolant to circulate through the system, including the heat exchangersCAUTION Do not operate the engine without thermostatRemoval of the thermostat may cause overcooling or in some cases may cause loss of coolant and overheatingThe engine may be seriously damaged if it is operated while too hot or too coolBe sure the correct thermostat is installedThermostats may appear to be similar, but may have entirely different operating characteristics