Chery Tiggo. Manual — part 374
Air Conditioner Control - 2.0L & 2.4L (Page 3 of 3)
GENERAL INFORMATION
LTSMW130003T
13
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.
CONDITION
POSSIBLE CAUSES
CORRECTION
Normal Pressures, But A/C
Performance Test Air Temperatures
At Center Panel Outlet Are Too High
· Excessive refrigerant oil in system.
· Blend door inoperative or sealing
improperly.
· Blend door actuator faulty or
inoperative.
· Recover the refrigerant from the
refrigerant system and inspect the
refrigerant oil content. Restore the
refrigerant oil to the proper level, if
required.
· Inspect the blend door for proper
operation and sealing. Repair if
required.
· Replace if faulty.
The Low Side Pressure Is Normal
Or Slightly Low, And The High Side
Pressure Is Too Low
· Low refrigerant system charge.
· Refrigerant flow through the
accumulator is restricted.
· Refrigerant flow through the
evaporator is restricted.
· Faulty compressor.
· Test the refrigerant system for
leaks. Repair, evacuate and charge
the refrigerant system, if required.
· Replace the restricted accumulator,
if required.
· Replace the restricted evaporator
coil, if required.
· Replace the compressor, if
required.
The Low Side Pressure Is Normal
Or Slightly High, And The High Side
Pressure Is Too High
· Condenser air flow restricted.
· Inoperative cooling fan.
· Refrigerant system overcharged.
· Air in the refrigerant system.
· Engine overheating.
· Check the condenser for damaged
fins, foreign objects obstructing air
flow through the condenser fins, and
missing or improperly installed air
seals. Clean, repair, or replace
components as required.
· Test the cooling fan and replace, if
required.
· Recover the refrigerant from the
refrigerant system. Charge the
refrigerant system to the proper
level, if required.
· Test the refrigerant system for
leaks. Repair, evacuate and charge
the refrigerant system, if required.
· Test the cooling system and repair
as necessary.
The Low Side Pressure Is Too High,
And The High Side Pressure Is Too
Low
· Accessory drive belt slipping.
· Faulty compressor.
· Inspect the accessory drive belt
condition and tension. Tighten or
replace the accessory drive belt, if
required.
· Replace the compressor, if
required.
The Low Side Pressure Is Too Low,
And The High Side Pressure Is Too
High
· Restricted refrigerant flow through
the refrigerant lines.
· Restricted refrigerant flow through
the A/C accumulator.
· Restricted refrigerant flow through
the condenser.
· Faulty A/C expansion valve.
· Inspect the refrigerant lines for
kinks, tight bends or improper
routing. Correct the routing or
replace the refrigerant line, if
required.
· Replace the accumulator if
restricted.
· Replace the restricted condenser, if
required.
· Test A/C expansion valve and
replace, if required.
DIAGNOSIS & TESTING
13
Heater Performance
Engine coolant is delivered to the heater core through heater hoses. With the engine idling at normal operating tem-
perature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat
position, and the blower motor switch knob in the highest speed position. Using a test thermometer, check the tem-
perature of the air being discharged at the HVAC housing floor outlets. Compare the test thermometer reading to the
heater performance chart.
HEATER PERFORMANCE
Ambient Air
Temperature
15.5°C (60°F)
21.1°C (70°F)
26.6°C (80°F)
32.2°C (90°F)
Minimum Air
Temperature at Floor
Outlet
62.2°C (144°F)
63.8°C (147°F)
65.5°C (150°F)
67.2°C (153°F)
Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than
the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine
coolant flow obstruction in the cooling system.
Obstructed Coolant Flow
Possible locations or causes of obstructed coolant flow:
• Pinched or kinked heater hoses.
• Improper heater hose routing.
• Plugged heater hoses or supply and return ports at the cooling system connections.
• A plugged heater core.
Mechanical Problems
Possible locations or causes of insufficient heat:
• An obstructed cowl air intake.
• Obstructed heater system outlets.
• A blend door not functioning properly.
• Trapped air in system.
Temperature Control
If the heater outlet air temperature cannot be adjusted with the temperature control knob(s) on the A/C heater control
panel, the following could require service:
• The A/C heater control panel.
• The blend door.
• The blend door cable.
• Improper engine coolant temperature.
DIAGNOSIS & TESTING
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