2003 Polaris 3 PRO X Factory Service Manual, Page 90Get this manual
ENGINE 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 manualNOTE: Always use Polaris premium antifreeze 6040 premixBleed system at specified RPM or air will remain trapped in system, which may result in overheating
Filling and Bleeding Procedure
If the cooling system should become low in the reservoir tank andor filler neck, the system should be bled of any trapped air using one of the following procedures, depending on model