1979 Ski-Doo Supplementary Shop Manual, Page 83Get this manual
SECTION 04
SOUS-SECTION 02 (MOTEURS)
COOLING SYSTEM (Elite 450) INSPECTION
Check general condition of hoses and clamps tightness
REFILLING THE SYSTEM
Capacity: 6.25 liters (1.4 Impgal (1.7 U.Sgal 60 concent rated antifreeze
DRAINING THE SYSTEM
To drain the cooling systemremove the coolant tank capRemove the RHaccess grill, and connect length of plastiC hose to the radiator drain va lve in orde to drain the cooling system outside of the bodyOpen the drain valve