2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 223Get this manual
1F-4 Engine Cooling System:
Diagnostic Information and Procedures
Engine Cooling Symptom Diagnosis
Condition Engine overheats Possible cause Not enough engine coolantRadiator core clogged with dirt or scaleFaulty cooling fanDefective cooling fan relay, or open-orshort circuitedClogged engine coolant passageAir trapped in the cooling circuitDefective water pumpUse of incorrect engine coolantDefective thermostatDefective ECT sensorDefective ECMDefective cooling fan relay, or open-orshort circuitedExtremely cold weatherDefective thermostatDefective ECT sensorDefective ECMB933H21604001
CorrectionReference Item Add engine coolantCleanRepair or replaceRepair or replaceCleanBleed airReplaceReplaceReplaceReplaceReplaceRepair or replacePut on radiator coverReplaceReplaceReplace
Engine over cools
Repair Instructions
Cooling Circuit Inspection!
B933H21606001