1978 Ski-Doo Shop Manual, Page 166Get this manual
SECTION 04 SUB-SECTION 02, (ENGINES) (
COOLING SYSTEM
INSPECTION
Check general condition of hose and clamp tightness
REFILLING THE SYSTEM
Capacity: 2.5 liters approximately (0.5 Imp, qal (0.6 U,Sqal 60 concentrated antifreeze40 water
DRAINING THE SYSTEM
To drain the cooling system, remove the coolant tank cap and disconnect the by-pass hose from fitting on cylinder headBy-pass hose fitting
To refill the cooling system, disconnect by-pass hose and keep it near fitting on cylinder head; refill tank and blow into it through the vent tube, while maintaining the hand over the filler neck until the liquid comes out at the by-pass hose and the fitting on cylinder head
NOTE: It is necessary to refill tank as soon as it becomes empty