Page 471 - Foton Workshop Manual - Auman EST-M

Diagnosis - Mechanical fault diagnosis DI - 417

Failure phenomenon Possible reason Failure elimination IN

Check the coolant level and if there is external
Coolant level lower than specification DI
leakage

Fan drive belt broken or loose Check the fan drive belt
EG
Air-air cooler radiation fin, radiation fin or
Check the air-air cooler, AC condenser and
AC condenser radiation fin broken or
radiation fin. Clean them if necessary
blocked by bits TR
Thermostat broken Replace the thermostat

Test the thermometer. If necessary, perform AX
Coolant thermometer failed
service or replace it

Coolant temperature higher Test the temperature sensor. If necessary, perform FR
Temperature sensor failure
than normal service or replace it

value---suddenly overheated Cooling system blocked or leaking Check the radiator hose
ST
Filling pipe or degassing pipe blocked, Check if the degassing pipe and filling pipe are

choked or pipeline arrangement not correct arranged correctly and if they are blocked
BR
Check the cylinder body pressure and replace
Water pump failure
the water pump if necessary
BW
Radiator cover not correct or failed or low
Check the radiator pressure cover
specification in standing pressure
EL
Cooling system part failed Perform the cooling system diagnosis test

Test the thermometer. If necessary, perform
Coolant thermometer or sensor failed
service or replace it

Thermostat broken Replace the thermostat

Coolant temperature higher Fan drive or control device failure Check the fan drive and control device

than normal Long time idle can cause too low temperature in
Engine idle time too long
value---suddenly overheated engine oil and coolant

Cooling system part failed Perform the cooling system diagnosis test

Check the engine oil cooler and replace it if
Engine oil cooler failed
necessary

Air compressor cylinder head cracked Check the cylinder heand and gasket of air
or with holes or gasket leaking compressor
Coolant mixed with engine
Perform pressure test for the cooling system and
oil Internal coolant leaking
check if there is any leakage
Cylinder head gasket leaking Check the cylinder heand gasket

Cylinder head cracked or with holes Perform the pressure test for the cylinder head
Cylinder body cracked or with holes Check the cylinder body

DI-417