COOLING(H4DO) > Engine Cooling System Trouble in General
INSPECTION
Trouble | Possible cause | Corrective action |
Over-heating | a. Insufficient engine coolant | Replenish engine coolant, inspect for leakage, and repair it if necessary. |
b. Defective thermostat | Replace. | |
c. Malfunction of water pump | Replace. | |
d. Clogged engine coolant passage | Clean. | |
e. Improper ignition timing | Inspect and repair ignition control system. Basic Diagnostic Procedure"> | |
f. Clogged or leaking radiator | Clean, repair or replace. | |
g. Defective radiator cap | Replace. | |
h. Improper engine oil in engine coolant | Replace the engine coolant. If ineffective, check, repair or replace engine components. | |
i. Air/fuel mixture ratio too lean | Inspect and repair the fuel injection system. Basic Diagnostic Procedure"> | |
j. Excessive back pressure in exhaust system | Clean or replace. | |
k. Insufficient clearance between piston and cylinder | Adjust or replace. | |
l. Slipping clutch | Repair or replace. | |
m. Dragging brake | Adjust. | |
n. Malfunction of radiator fan | Inspect the radiator fan relay, engine coolant temperature sensor or fan motor and replace them. | |
Over-cooling | a. Ambient temperature extremely low | Partly cover radiator front area. |
b. Defective thermostat | Replace. | |
Engine coolant leaks | a. Loosened or damaged connecting units on hoses | Repair or replace. |
b. Leakage from water pump | Replace. | |
c. Leakage from water pipe | Repair or replace. | |
d. Leakage around cylinder head gasket | Retighten cylinder head bolts or replace cylinder head gasket. | |
e. Damaged or cracked cylinder head and cylinder block | Repair or replace. | |
f. Damaged or cracked thermostat cover | Repair or replace. | |
g. Leakage from radiator | Repair or replace. | |
Noise | a. Defective radiator fan | Replace. |
b. Defective water pump bearing | Replace water pump. | |
c. Defective water pump mechanical seal | Replace water pump. |
Stopping engine
Stop the vehicle completely.
Move the select lever to the "P"
position.
Press the push-button ignition switch.
The engine will stop, and the power will be
switched off.
WARNING
Do not touch the push-button
ignition switch during driving.
When the push-button ignition
switch is ...
Inspection
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Preparation tool
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > General DescriptionPREPARATION TOOL1. SPECIAL TOOLILLUSTRATIONTOOL NUMBERDESCRIPTIONREMARKS — SUBARU SELECT MONITOR 4Used for setting of each function and troubleshooting for electrical system.NOTE:For detailed operation procedures of Subaru Select Monitor ...