Downloaded from www.Manualslib.com manuals search engine Cooling System Troubleshooting Chart
CONDITIONPOSSIBLE CAUSES CORRECTION
Loss of Coolant · Coolant hoses or tubes
· Hose clamps
· Coolant pump gasket
· Thermostat gasket
· Thermostat housing
· Radiator
· Coolant reservoir
· Pressure relief cap
· Coolant pump leaking
· Heater core
· Engine gaskets (may leak
internally or externally)
· Cylinder block core plugs· Replace coolant hoses or tubes
· Replace hose clamps
· Replace coolant pump gasket
· Replace thermostat gasket
· Repair/replace thermostat housing
· Repair/replace radiator
· Replace coolant reservoir
· Replace pressure relief cap
· Replace coolant pump
· Replace heater core
· Replace engine gaskets
· Replace cylinder block core plugs
Engine Overheats · Low coolant level
· External engine coolant leak
· Air lock in system
· Pressure relief cap installation
· Restricted airflow through the A/C
condenser/radiator
· Internal engine coolant leak
· Coolant condition/concentration
· Electric cooling fan
· Radiator
· Thermostat
· Engine coolant temperature
indicator gauge
· Heater core
· Coolant pump
· Coolant flow restriction· Add coolant as needed
· Repair engine coolant leak
· Bleed air from cooling system
· Ensure pressure relief cap is
installed correctly
· Remove restriction from the A/C
condenser/radiator
· Repair internal engine coolant leak
· Repair coolant condition/
concentration as needed
· Replace electric cooling fan(s)
· Repair/replace radiator
· Replace thermostat
· Verify engine coolant temperature
indicator gauge operation
· Replace heater core
· Replace coolant pump
· Repair cause of coolant flow
restriction
Engine Does Not Reach Normal
Operating Temperature · Thermostat
· Electric cooling fan always on
· Engine coolant temperature
indicator gauge· Replace thermostat
· Repair cause of electric cooling fan
always on
· Verify engine coolant temperature
indicator gauge operation
Electric Cooling Fan(s) Does Not
Operate · Fuse and Relay Box
· Wiring
· Relay(s)
· Fuse(s)
· Engine Control Module (ECM)
· Cooling fan motor(s)· Repair/replace Fuse and Relay
Box
· Repair wiring
· Replace relay(s)
· Replace fuse(s)
· Replace the ECM
· Replace cooling fan motor(s)
Electric Cooling Fan(s) On All The
Time · Wiring
· Relay(s)
· Engine Control Module (ECM)· Repair wiring
· Replace relay(s)
· Replace the ECM
DIAGNOSIS AND TESTING
06–12Chery Automobile Co., Ltd.
Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
A/C System Performance
The ambient air temperature must be a minimum of 21°C for this test.1. Connect a manifold gauge set.
2. Set the A/C Heater mode control switch knob in the Panel position, the temperature control knob in the full cool position, the A/C button in the On position, and the blower motor switch knob in the highest speed position.
3. Start the engine and hold the idle at 2,000 RPM with the compressor clutch engaged.
4. The engine should be at operating temperature. The doors and windows must be open.
5. Insert a thermometer in the driver side center A/C (panel) outlet. Operate the engine for five minutes.
6. The compressor clutch may cycle, depending upon the ambient temperature and humidity.
7. With the compressor clutch engaged, record the discharge air temperature and the compressor discharge pres- sure.
8. Compare the discharge air temperature to the performance temperature and pressure chart.
NOTE :
The discharge air temperatures will be lower if the humidity is less than the percentages shown.
TEMPERATURE AND PRESSURE
Ambient Air
Temperature and
Humidity 21°C ( 80%
humidity) 27°C ( 80%
humidity) 32°C ( 80%
humidity) 38°C ( 50%
humidity) 43°C ( 20%
humidity)
Air Temperature
at Center Panel
Outlet 10 - 13°C 14 - 17°C 15 - 18°C 17 - 20°C 14 - 17°C
Evaporator Inlet
Pressure at
Charge Port 241 - 276 kPa 262 - 290 kPa 269 - 296 kPa 275 - 303 kPa 262 - 290 kPa
Compressor
Discharge
Pressure 1241 - 1792 kPa 1380 - 1930 kPa 1380 - 1930 kPa 1655 - 2206 kPa 1567 - 2068 kPa
A/C System Troubleshooting Chart
CONDITION
POSSIBLE CAUSES CORRECTION
Rapid Compressor Clutch Cycling
(ten or more cycles per minute) · Low refrigerant system charge.· Test the A/C system for leaks.
Repair, evacuate and charge the
refrigerant system, if required.
Equal Pressures, But The
Compressor Clutch Does Not
Engage · No refrigerant in the refrigerant
system.
· Faulty A/C compressor clutch coil.
· Faulty A/C pressure switch.
· Faulty A/C heater control module.
· Faulty A/C fuse.
· Faulty A/C compressor relay.
· Faulty Evaporator temperature
sensor.· Test the A/C system for leaks.
Repair, evacuate and charge the
A/C, if required.
· Test the compressor clutch coil and
replace, if required.
· Test the A/C high pressure switch
and replace, if required.
· Test the A/C heater control module
and replace, if required.
· Test A/C fuse and replace.
· Test A/C compressor relay and
replace, if required.
· Test evaporator temperature sensor
and replace if required.
13–12Chery Automobile Co., Ltd.
