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AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER]

AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER]

SM2335678

id0703c1700800

Troubleshooting item

Air from vents not cold enough
Description
• Insufficient cooled-airflow even if airflow temperature setting is MAX COLD
• Excessive time required to cool to set temperature
Possible cause
Note
• If the engine coolant temperature increases due to a cooling system malfunction, the fail-safe function disables the A/C operation.
• Blower unit or air filter blockage
• Drive belt malfunction
• Refrigerant pressure sensor malfunction
• Cooling fan operation malfunction
• Condenser fin blockage
• Expansion valve malfunction
• Insufficient compressor oil
• Poor installation of air mix link and air mix door for A/C unit
• Air mix actuator malfunction
• System piping malfunction
― Crushed piping
― Gas leakage from connecting area (improper installation, O-ring malfunction)
• Condenser malfunction
• Poor A/C compressor compression
• Evaporative temperature sensor malfunction
• Poor evaporator temperature sensor installation
• Receiver/drier malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT BLOWER UNIT AND AIR FILTER
• Are the blower unit intake or air filter clogged? (See AIR FILTER INSPECTION.)
Yes
Remove the cause of the blockage.
Replace the air filter if it is clogged.
(See AIR FILTER REMOVAL/INSTALLATION [(US)].)
After performing the repair, perform the repair completion verification.
No
Go to the next step.
2
INSPECT REFRIGERANT PRESSURE
• Inspect the refrigerant pressure. (See REFRIGERANT PRESSURE CHECK [(US)].)
• Is the refrigerant pressure normal?
Yes
Go to the next step.
No
Record the inspection results.
• If the refrigerant pressures on the high pressure and low pressure side are both high, go to Step 6.
• If the refrigerant pressures on the high pressure and low pressure sides are almost same, go to Step 9.
• If the refrigerant pressures on the high pressure and low pressure sides are both low, go to Step 11.
• If vacuum on the low pressure side and the refrigerant pressure on the high pressure side is extremely low, go to Step 12.
• If the refrigerant pressure on the high pressure side is low and the refrigerant pressure on the low pressure side is high, replace the A/C compressor, then perform the repair completion verification. (See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
• If the refrigerant pressure condition is under any condition other than the above, go to Step 14.
3
PERFORM AIR-CONDITIONING SYSTEM PERFORMANCE TEST
• Perform the air-conditioning system performance test. (See REFRIGERANT SYSTEM PERFORMANCE TEST [(US)].)
• Is the airflow temperature within the specified range?
Yes
Perform the repair completion verification.
No
Go to the next step.
4
INSPECT DRIVE BELT
• Inspect the drive belt. (See DRIVE BELT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].) (See DRIVE BELT INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the drive belt condition normal?
Yes
Go to the next step.
No
After adjusting the drive belt tension, go to the next step.
(See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
(See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
5
INSPECT A/C PRESSURE SENSOR
• Inspect the A/C pressure sensor. (See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER (US)].)
• Is the A/C pressure sensor normal?
Yes
Go to the next step.
No
Replace the refrigerant pressure sensor.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (US)].)
After performing the repair, perform the repair completion verification.
6
INSPECT COOLING FAN
• Verify the cooling fan operation. (See COOLING FAN MOTOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].) (See COOLING FAN MOTOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the cooling fan operation normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location according to the inspection results.
After performing the repair, perform the repair completion verification.
7
INSPECT CONDENSER
• Inspect the condenser. (See CONDENSER INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
• Is it normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location according to the inspection results.
(See CONDENSER REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
After performing the repair, perform the repair completion verification.
8
INSPECT SYSTEM PIPING
• Is the hose on the low pressure side hot to the touch?
Yes
Replace the refrigerant.
After vacuum discharging for 1 h and charging with refrigerant to the specified level, perform the repair completion verification.
(See REFRIGERANT CHARGING [(US)].)
No
Replace the refrigerant.
After vacuum discharging for 15 min and charging with refrigerant to the specified level, perform the repair completion verification.
(See REFRIGERANT CHARGING [(US)].)
9
INSPECT EXPANSION VALVE
• Remove the expansion valve and verify its condition. (See EXPANSION VALVE REMOVAL/INSTALLATION [(US)].)
• Is there refrigerant leakage or valve blockage?
Yes
If there is foreign matter blockage the valve, remove the foreign matter.
If there is refrigerant leakage or blockage, replace the expansion valve.
(See EXPANSION VALVE REMOVAL/INSTALLATION [(US)].)
Perform the repair completion verification.
No
Go to the next step.
10
DETERMINE IF MALFUNCTION CAUSE IS A/C COMPRESSOR OR AIR MIX ACTUATOR
• Start the engine and idle it.
• Access the following dash-electrical supply unit PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
― AIR MIX_R
― AIR MIX_L
• Are PID values normal?
Yes
After adjusting the compressor oil to the specified level, perform the repair completion verification.
(See A/C COMPRESSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
No
Verify the air mix link and air mix door installation conditions on the side where the PID is not normal.
(See A/C UNIT REMOVAL/INSTALLATION [(US)].)
Securely and correctly installed to positions
Replace the air mix actuator.
(See AIR MIX ACTUATOR REMOVAL [FULL-AUTO AIR CONDITIONER (US)].)
(See AIR MIX ACTUATOR INSTALLATION [FULL-AUTO AIR CONDITIONER (US)].)
Not securely and correctly installed to positions
Repair the air mix link and air mix door installation conditions.
(See A/C UNIT DISASSEMBLY/ASSEMBLY [(US)].)
Perform the repair completion verification.
11
INSPECT SYSTEM PIPING
• Verify if there is gas leakage from the system piping using the gas leak tester.
• Is the system piping normal?
Yes
Replace the crushed system piping or the malfunctioning location.
(See REFRIGERANT LINE REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
Perform the repair completion verification.
No
Replace the O-ring of the malfunctioning location (system piping connecting area). Or replace the malfunctioning location of the system piping.
(See REFRIGERANT LINE REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
Perform the repair completion verification.
12
INSPECT REFRIGERANT PRESSURE
• Does the refrigerant pressure on the low pressure side vary between the vacuum and normal range?
Yes
Replace the condenser (moisture has penetrated engine coolant).
(See CONDENSER REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
Perform the repair completion verification.
No
Go to the next step.
13
INSPECT EXPANSION VALVE
• Remove the expansion valve and verify its condition. (See EXPANSION VALVE REMOVAL/INSTALLATION [(US)].)
• Is there refrigerant leakage or valve blockage?
Yes
If there is foreign matter blockage the valve, remove the foreign matter.
If there is refrigerant leakage or blockage, replace the expansion valve.
(See EXPANSION VALVE REMOVAL/INSTALLATION [(US)].)
Perform the repair completion verification.
No
Install the expansion valve, then perform the repair completion verification.
14
INSPECT EVAPORATOR TEMPERATURE SENSOR
• Inspect the evaporator temperature sensor. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
• Is the evaporative temperature sensor normal?
Yes
Verify the evaporator temperature installation condition and repair the installation position.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (US)].)
Go to the next step.
No
Replace the evaporative temperature sensor.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (US)].)
After replacement, perform the repair completion verification.
15
DETERMINE IF MALFUNCTION CAUSE IS A/C COMPRESSOR OR AIR MIX ACTUATOR
• Start the engine and idle it.
• Access the following dash-electrical supply unit PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION).
― AIR MIX_R
― AIR MIX_L
• Are PID values normal?
Yes
Perform the repair completion verification.
No
Verify the air mix link and air mix door installation conditions on the side where the PID is not normal.
(See A/C UNIT REMOVAL/INSTALLATION [(US)].)
Securely and correctly installed to positions
Replace the air mix actuator.
(See AIR MIX ACTUATOR REMOVAL [FULL-AUTO AIR CONDITIONER (US)].)
(See AIR MIX ACTUATOR INSTALLATION [FULL-AUTO AIR CONDITIONER (US)].)
Not securely and correctly installed to positions
Repair the air mix link and air mix door installation conditions.
(See A/C UNIT DISASSEMBLY/ASSEMBLY [(US)].)
Perform the repair completion verification.
Repair completion verification
VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
• If refrigerant was discharged during inspection and not recharged, perform vacuum discharging and charge with new refrigerant to the specified level. (See REFRIGERANT CHARGING [(US)].)
• Is there cool airflow (is the result of refrigerant system performance test normal?) ? (See REFRIGERANT SYSTEM PERFORMANCE TEST [(US)].)
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)].)
If the CAN communication is normal, perform the diagnosis from Step 1.