2004 Skidoo Tundra Skandic Series Service Manual, Page 196Get this manual
Section 04 ENGINE Subsection 09 (LIQUID COOLING SYSTEM)
COOLING SYSTEM LEAK TEST
Install special radiator cap (PN 529 021 400) included in engine leak tester kit (PN 861 749 100) on coolant tankInstall hose pincher (PN 295 000 076) on overflow hoseUsing pump also included in kit pressurize all system through coolant reservoir to 100 kPa (15 PSI)Check all hoses and cylinderbase for coolant leaksSpray soapwater solution and look for air bubbles
1, Pressure Cap
Check if the cap pressurizes the systemIf not, install new 90 kPa (13 PSI) cap (do not exceed this pressure)
5, Thermostat
To check thermostat, put in water and heat waterThermostat should start to open when water temperature reaches the following degreeIt will be almost fully open at 50C (122F)ENGINE 593 TEMPERATURE 42C (108F)
Thermostat is double action typeaIts function is to give faster warm up of the engine by controlling circuit; water pump engine coolant tankThis is done by bypassing the radiator circuit.A32C3AA