1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 76Get this manual
IEngine Overheats SYSTEMCOMPONENT CAUSES ACTIONS
Visual inspectionclean Verify installation Check water pressure See 60 LV Service Manual Look for air in cooling system discharge See 60 LV Service Manual
Blocked Intake Screens Engine too High on Transom DamagedWorn Water Pump Impeller Water Supply System Poorly Sealed Water Pump Components Plugged Vent Hole Pump Housing Damaged Thermostat Blocked or Restricted Passage Powerhead Cooling on Water