Mitsubishi 3000GT Service Manual page 407

ENGINE COOLING - Specifications / Troubleshooting
SEALANT
Items
Engine coolant temperature gauge unit
Engine coolant temperature sensor (Engine control)
Engine coolant temperature sensor (Air conditioning)
TROUBLESHOOTING
Symptom Probable cause
Overheat Insufficient engine coolant
Too high an anti-freeze concentration
Damaged or blocked (insufficiently ventilated) radiator fins
Faulty thermostat operation
Faulty water pump operation
Water passage clogged with slime or rust deposit or foreign substance
Overheat Inoperative electric
cooling fan
Water leaks
Faulty automatic
transaxle oil cooler
operation
No rise in Faulty thermostat
temperature
Faulty coolant temperature sensor
Engine coolant temperature sensor
Faulty electrical motor
Faulty radiator fan relay
Damaged radiator core joint
Corroded or cracked hoses
(radiator hose, heater hose, etc.)
Faulty cap valve or setting of spring
Cracked thermostat housing
Loose water pump mounting bolt or leaking
gasket
Loose bolt or leaking gasket in water outlet fitting
Loose bolt or leaking gasket in water inlet fitting
Loose thermostat housing bolts or leaking from
gasket
Blocked or collapsed hose and pipe
Loose hose and pipe connection
TSB Revision
Specified sealants
3M Nut Locking Part No. 4171
Remedy
Replenish
Correct anti-freeze
concentration
Correct
Replace
Clean
Replace
Replace
Correct or replace
Retorque bolts or
replace gasket
Replace
Correct
Replace