Page 224 - Foton Workshop Manual - Auman EST-M

DI - 170 Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts

Failure phenomenon Possible reason Failure elimination
Replace the leaking parts and refill
1. Refrigerant (leaking)
refrigerant
2. Expansion valve (opening too small Check, repair or replace the expansion
or blocked) valve
Discharge the refrigerant completely and
3. Refrigeration system (entrained air)
Air conditioning refrigeration refill
insufficient 4. Condenser (cooling fin damaged or Clean the condenser assembly and repair
covered with dirt) the radiation fin
5. Evaporator (cooling fin damaged or Clean the condenser assembly and repair
covered with dirt) the radiation fin
6. Drying tank (blocked) Replace the condenser assembly
7. Condenser (clogged) Repair the condenser assembly
Normal phenomenon, turn off the air
1. The temperature in the cabin is low
Air conditioning is normal in the conditioning for some time
beginning, but slowly, the air opening is 2. Improper operation Correct operation
not cool 3. Evaporator temperature sensor
Replace the temperature sensor
(damaged)
1. Air condition controller (wind Check, repair or replace the AC
Air supply mode can not be switched direction adjustment knob failure) controller
into Repair or replace the mode throttle
2. Mode throttle actuator
actuator
1 Air condition controller (temperature Check, repair or replace the AC
Warm and cold mode can not be control button failure) controller
switched Repair or replace the hybrid throttle
2. Hybrid throttle actuator
actuator
1. Warm air ventilation duct (joints
Connect the warm air ventilation duct
falling off)
2. Refrigerant (insufficient or
No warm braw or warm braw not Add refrigerant
obstructed)
sufficient
Use tweezers or fin combs to correct the
3. Heater core fins (deformed)
fins
4. Warm air pipeline (blocked) Clean the warm air pipeline
There are plenty of oil stains on the
1. Bad fixing, cracks, loose connections, Remove the pipe connection, replace the
connection part of piping and the air
and seal ring ruptured seal ring and refill the refrigerant
conditioning fails to refrigerate
Remove foreign objects inside the
1. Blower motor (with foreign objects)
Abnormal sound of blower blower
2. Blower motor (broken or aged) Replace the fan
1. Compressor assembly (fixed bolt Retighten the bolts of compressor
loose) assembly
In air conditioning refrigeration, the 2. Internal piston, suction and exhaust
compressor continues to give out valve of compressor (mutual Replace the compressor
abnormal sound interference or damaged)
Re-vacuum and add appropriate amount
3. Compressor (liquid impact)
of refrigerant

DI-170