1999 Ski-Doo Factory Shop Manual Volume Two, Page 158Get this manual
Subsection 08
Section 04 ENGINE (LIQUID COOLING SYSTEM)
LIQUID COOLING SYSTEM LEAK TEST
Install special plug (radiator cap) (PN 529 021 400) and hose pincher (PN 529 009 900) on overflow hosePressurize all system through coolant reservoir to 15 PSICheck all hoses and cylinderbase for coolant leaksSpray soapwater solution and look for air bubbles
A18C0EA
TYPICAL
When the coolant level is low enough, lift the rear of vehicle to drain the radiators
DISASSEMBLY AND ASSEMBLY
A01B4AA
529 009 900
3,4, Sender and Plug
Apply thread sealant on sender and plug to avoid leaks