2004 Skidoo ZX Series Service Manual, Page 238Get this manual
Section 05 ENGINES (4-TEC) Subsection 04 (COOLING SYSTEM)
After the first few kilometers (miles) of running recheck level
Inspection
Check the water pump housing for cracks or other damageReplace water pump housing if damaged
COOLANT HOSES
Any damagedleaky or brittle coolant hose or component must be replacedWhen replacing hose, also replace the clampsAt installation, do not twist or bend the hoses
WATER PUMP HOUSING THERMOSTAT
The thermostat is dual action type
Removal
NOTE: The thermostat is located on the ignition coverThermostat and water pump housing form one unit and can only be replaced as one complete componentDrain cooling system (refer to DRAINING THE SYSTEM above)Remove: water pump housing screws no12 and no13 and pull water pump housing no11