1986 Ski-Doo Factory Shop Manual, Page 201Get this manual
Section 02 ENGINE Sub-section 09 (537 ENGINE TYPE)
B- When the liquid is warmed to 42C 1l07.6F), the thermostat opens the circuit, water pumpengineheat exchangersreservoir to keep the liquid at the desired temperature(See the diagram to the exploded view)
- Stop engine and check coolant levelRefill as required then put back the cap
WARNING: Before removing the cap place cloth over the coolant tank and release the cap to
the first step to release the pressureLoss of fluid and possibility of severe burns could occur if this notice is disregarded
From cylinders
QPEN THE-RMOSTAT, WARM ENGINE
These twO functions have the advantage of preventing massive entry of cold water into the engine
REFILLING THE SYSTEM
Capacity: Approximately 4.2 liters (148 Imp, oz) (142 U.SOl) 60 antifreeze40', water