2003 Polaris Deep Snow Snowmobiles Service Manual, Page 121Get this manual
ENGINES Cooling System
WARNING
Never remove the pressure cap when the engine is warm or hotIf the pressure cap is to be removed, the engine must be coolSevere personal injury could result from steam or hot liquidUse of non-standard pressure cap will not allow the recovery system to function properlyIf the cap should need replacement, install the correct Polaris cap with the same pressure ratingRefer to the appropriate parts manual
Coolant Level