2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 195Get this manual
COOLING SYSTEM COMPONENTS
COMPONENTS
General Description
All models use two-stage cooling system designThe cooling system is dependent on water pump pressure and controlled by thermostat and pressure relief valve operation
IMPORTANT: Restricted or inadequate water
flow through the outboard reduces cooling system performance and may lead to severe powerhead damage
Water Pump and Intakes