Hyundai Sonata 1991 Shop Manual page 104

TROUBLESHOOTING
GENERAL
Y25CFOA
Symptom
Probable cause
Remedy
Low coolant level Leakage of coolant
Damaged radiator core joint Replace
Corroded or cracked hoses Replace
(Radiator hose, heater hose, etc)
Faulty radiator cap valve or setting of spring Replace
Faulty thermostat
Replace
Faulty water pump Replace
Clogged radiator
Foreign material in coolant
Replace
Abnormally high coolant
Faulty thermostat Replace
temperature Faulty radiator cap Replace
Restriction of flow in cooling system Replace
Loose or missing drive belt Adjust or replace
Faulty water pump Replace
Faulty temperature gauge or wiring Repair or replace
Fault)' electric fan
Repair or replace
Faulty thermo-sensor on radiator
Replace
Insufficient coolant
Refill coolant
Abnormally low coolant
Faulty thermostat
Replace
temperature
Faulty temperature gauge or wiring Repair or replace
Leakage from oil cooling Loose hose and pipe connection
Retighten
system
Cracked or collapsed hose and pipe Replace
Inoperative electrical cooling Damaged
Replace or repair
fan
25-4