1979 Ski-Doo Supplementary Shop Manual, Page 62Get this manual
SECTION 04 SUB-SECTION 02 (ENGINES )
COOLING SYSTEM
INSPECTION
Check general condition of hoses and clamp tigh tness
Blizzard 9500 Plus
To drain the coo li ng system, remove the coolant tank capWARNING: Never drain or refill the cooling system when engine is hotCon nect drain hose to drain valve at pump housing Open va lve and drain system
DRAINING THE SYSTEM
Blizzard 7500Super Sonic
To drain the cooling system, remove the coola nt tank cap and disconnect the by-pass hose from fitting on cylinder headBy-pass hose fitting