2003 Ski-Doo REV Series Factory Shop Manual, Page 138Get this manual
Subsection 06
Section 04 ENGINE (LIQUID COOLING SYSTEM)
bWhen the liquid is warmed enough, the thermostat opens progressively the circuit, water pump engine radiators coolant tank to keep the liquid at the desired temperature(See the diagram of the exploded view)
Refilling Procedure
IMPORTANT: USE THE 5050 PREMIXED COOLANT37C (- 35F) (PN 293 600 038)Do not reinstall pressure capOpen heated carburator valve no81 2
A16C03A
A33C01A
TYPICAL OPEN THERMOSTAT, WARM ENGINE 1To radiators 2From cylinders