Engine Cooling System Trouble In General; Transmission Gear Oil - Subaru LEGACY 2006 Manual

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12.Engine Cooling System Trouble in General

A: INSPECTION
Trouble
a. Insufficient engine coolant
b. Defective thermostat
c. Malfunction of water pump
d. Clogged engine coolant passage
e. Improper ignition timing
f. Clogged or leaking radiator
g. Improper engine oil in engine coolant
Overheating
h. Air/fuel mixture ratio too lean
i. Excessive back pressure in exhaust system
j. Insufficient clearance between piston and cylinder
k. Slipping clutch
l. Dragging brake
m. Faulty transmission gear oil
n. Malfunction of radiator fan
a. Ambient temperature extremely low
Over-cooling
b. Defective thermostat
a. Loosened or damaged connecting units on hoses Correct or replace.
b. Leakage from water pump
c. Leakage from water pipe
Engine cool- d. Leakage around cylinder head gasket
ant leaks
e. Damaged or cracked cylinder head and cylinder
block
f. Damaged or cracked thermostat case
g. Leakage from radiator
a. Defective drive belt
b. Defective radiator fan
Strange noise
c. Defective water pump bearing
d. Defective water pump mechanical seal
Engine Cooling System Trouble in General
Possible cause
CO(H6DO)-25
Corrective action
Replenish engine coolant, inspect for leakage, and repair
it if necessary.
Replace.
Replace.
Clean.
Inspect and repair ignition control system. <Ref. to
EN(H6DO) (diag)-2, PROCEDURE, Basic Diagnostic
Procedure.>
Clean, repair or replace.
Replace engine coolant.
Inspect and repair the fuel injection system. <Ref. to
EN(H6DO) (diag)-2, PROCEDURE, Basic Diagnostic
Procedure.>
Clean or replace.
Adjust or replace.
Correct or replace.
Adjust.
Replace.
Inspect the radiator fan relay, engine coolant temperature
sensor or fan motor and replace them.
Partly cover radiator front area.
Replace.
Replace.
Correct or replace.
Retighten cylinder head bolts or replace gasket.
Correct or replace.
Correct or replace.
Correct or replace.
Replace.
Replace.
Replace water pump.
Replace water pump.
COOLING