NO.6 AIR FROM VENTS NOT COLD ENOUGH [FULL-AUTO AIR CONDITIONER]
id0702c1812500
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6
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Air from vents not cold enough.
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DESCRIPTION
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• Magnetic clutch operates but A/C system malfunctions.
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POSSIBLE CAUSE
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• Drive belt malfunction
• Refrigerant pressure sensor malfunction (SKYACTIV-G 2.0, MZR 2.5, MZR 2.0, MZR 2.0 DISI i-stop, MZR 2.3 DISI Turbo, MZ-CD 1.6)
• Refrigerant pressure switch malfunction (MZR 1.5, MZR 1.6, MZR-CD 2.2)
• Cooling fan system malfunction
• Condenser or related part malfunction
• A/C unit or condenser malfunction
• Receiver/drier or expansion valve malfunction (valve closes too mach)
• Malfunction in refrigerant lines
• A/C compressor system malfunction, insufficient compressor oil
• Over filling of compressor oil, malfunction in expansion valve or A/C unit air mix link system
• Evaporative temperature sensor malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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CHECK MALFUNCTION SYMPTOMS
• Is malfunctions occur in only when operating the i-stop?
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Yes
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Perform the i-stop troubleshooting.
(See FOREWORD [SKYACTIV-G 2.0].)
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No
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Go to the next step.
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2
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INSPECT CLIMATE CONTROL UNIT FOR DTC
• Retrieve the climate control unit DTC using the M-MDS.
• Are there DTC displayed?
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Yes
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Go to the applicable DTC troubleshooting procedures. (See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
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No
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Go to the next step.
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3
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INSPECT REFRIGERANT PRESSURE TO LOCATE MALFUNCTION
• Perform refrigerant pressure check. (See REFRIGERANT PRESSURE CHECK.)
• Is the refrigerant pressure normal?
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Yes
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Go to the next step.
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No
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Record the inspection result.
• If the refrigerant high-pressure and low-pressure values are both high, go to Step 9.
• If the refrigerant high-pressure and low-pressure values are approximately the same, go to Step 12.
• If the refrigerant high-pressure and low-pressure values are both low, go to Step 14.
• If there is a vacuum on the low pressure side and extremely low pressure on the high pressure side, go to Step 20.
• If there is low pressure on the high pressure side and high pressure on the low pressure side, replace the A/C compressor, then go to Step 24. (See A/C COMPRESSOR REMOVAL/INSTALLATION.)
• If the refrigerant pressure is other than above condition, go to Step 22.
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4
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INSPECT REFRIGERANT SYSTEM PERFORMANCE
• Perform refrigerant system performance test.
• Is the operation normal?
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Yes
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Operation is normal. (Recheck malfunction symptoms.)
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No
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Go to the next step.
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5
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INSPECT DRIVE BELT
• Inspect the drive belt.
• Is it normal?
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Yes
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Go to the next step. (SKYACTIV-G 2.0, MZR 2.5, MZR 2.0, MZR 2.0 DISI i-stop, MZR 2.3 DISI Turbo, MZ-CD 1.6)
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Go to Step 7. (MZR 1.5, MZR 1.6, MZR-CD 2.2)
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No
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Adjust or replace the drive belt, then go to the next step. (SKYACTIV-G 2.0, MZR 2.5, MZR 2.0, MZR 2.0 DISI i-stop, MZR 2.3 DISI Turbo, MZ-CD 1.6)
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Adjust or replace the drive belt, then the go to step 7. (MZR 1.5, MZR 1.6, MZR-CD 2.2)
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6
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INSPECT REFRIGERANT PRESSURE SENSOR
• Inspect the refrigerant pressure sensor.
• Is it normal?
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Yes
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Go to Step 9.
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No
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Repair or replace malfunctioning part according to inspection result, then go to Step 24.
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7
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INSPECT REFRIGERANT PRESSURE SWITCH
• Inspect the refrigerant pressure switch.
• Is it normal?
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Yes
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Go to the next step.
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No
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Replace the refrigerant pressure switch, then go to Step 24.
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8
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INSPECT REFRIGERANT PRESSURE SWITCH RELATED HARNESS
• Inspect following refrigerant pressure switch wiring harness (open or short circuit) and connectors (corrosion, pulled out pins)
• Is it normal?
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Yes
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Go to the next step.
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No
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Repair or replace malfunctioning part according to inspection result, then go to Step 24.
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9
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INSPECT COOLING FAN OPERATION
• Verify the cooling fan operation.
• Is the cooling fan operation normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location according to the inspection results.
Then go to Step 24.
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10
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VISUALLY INSPECT CONDENSER
• Is the condenser fin clogged or obstructed by foreign material?
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Yes
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Remove the foreign material.
Repair the condenser fin.
Then go to Step 24.
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No
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Go to the next step.
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11
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CHECK REFRIGERATION SYSTEM FOR OVERCHARGE OR AIR CONTAMINATION
• Is the low side line hot to the touch?
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Yes
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Recover refrigerant. Evacuate system for one hour. Refill with correct amount of refrigerant, and go to step 24.
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No
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Recover refrigerant, evacuate for 15 minutes, refill with correct amount and go to step 24.
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12
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CHECK TO SEE WHETHER MALFUNCTION IS IN EXPANSION VALVE OR ELSEWHERE
• Compare the refrigerant pressure of the low pressure side with the high pressure side at Step 3.
• Is there little difference between the high pressure side and low pressure side readings (refer to graph in REFRIGERANT PRESSURE CHECK procedure)? (See REFRIGERANT PRESSURE CHECK.)
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Yes
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Replace the expansion valve.
After performing the following servicing, go to Step 24.
• Adjust the compressor oil to the specified level.
• After discharging, charge with new refrigerant to the specified level.
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No
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Go to the next step.
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13
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INSPECT AIR MIX DOOR RELATED PART INSTALLATION
• Measure the climate control unit terminal 1G and 1I voltage when the temperature control dials are set to MAX COLD and MAX HOT by control panel.
• Are voltages normal?
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Yes
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Adjust the compressor oil to the specified amount, then go to Step 24.
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No
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• Inspect the air mix link, air mix crank, and air mix rod of the A/C unit correctly and securely installed to their positions. (See A/C UNIT REMOVAL/INSTALLATION.)
• Repair or install correctly for suspect part according to inspection result, then go to Step 24.
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14
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INSPECT A/C UNIT FOR BLOCKAGE
• Is the A/C unit intake and air filter clogged?
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Yes
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Remove the cause of the clogging. Replace the air filter if it is clogged.
Then go to Step 24.
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No
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Go to the next step.
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15
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CHECK TO SEE WHETHER MALFUNCTION IS REFRIGERANT LINE LEAKAGE OR ELSEWHERE
• Verify if there is gas leakage from the system hoses using the gas leak tester.
• Is there gas leakage?
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Yes
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If there is leakage from a system hose connection area, go to Step 16. If there is leakage other than from a system hose connection area, go to Step 19.
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No
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Go to the next step.
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16
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VISUALLY INSPECT REFRIGERANT LINE
• Is a system hose crushed?
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Yes
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Replace the crushed system hose.
After performing the following servicing, go to Step 24.
• Adjust the compressor oil to the specified level.
• After discharging, charge with new refrigerant to the specified level.
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No
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Go to Step 23.
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17
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CHECK TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT LINE JOINT LOOSE OR O-RING
• Tighten the system hose connection area to the specified torque.
• Has the leakage stopped?
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Yes
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Go to the next step.
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No
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Go to Step 18.
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18
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VISUALLY INSPECT REFRIGERANT LINE
• Is a system hose crushed?
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Yes
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Replace the crushed system hose.
After performing the following servicing, go to Step 24.
• Adjust the compressor oil to the specified level.
• After discharging, charge with new refrigerant to the specified level.
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No
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Adjust the compressor oil to the specified amount, then go to Step 24.
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19
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VISUALLY INSPECT REFRIGERANT LINE
• Is a system hose crushed?
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Yes
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Replace the O-ring of the leaking area.
Replace the crushed system hose.
After performing the following servicing, go to Step 24.
• Adjust the compressor oil to the specified level.
• After discharging, charge with new refrigerant to the specified level.
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No
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Replace the O-ring of the leaking area.
After performing the following servicing, go to Step 24.
• Adjust the compressor oil to the specified level.
• After discharging, charge with new refrigerant to the specified level.
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20
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CHECK TO SEE WHETHER MALFUNCTION IS WATER IN REFRIGERANT SYSTEM OR ELSEWHERE
• Is there is no refrigerant pressure on the low pressure side, or is it normal?
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Yes
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Replace the condenser. (Water in refrigerant system)
Go to Step 24.
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No
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Go to the next step.
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21
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CHECK TO SEE WHETHER MALFUNCTION IS IN RECEIVER DRYER FILTER OR EXPANSION VALVE
• Remove the expansion valve and verify its condition.
• Is there refrigerant leakage or valve clogging?
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Yes
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If there is foreign matter clogging the valve:
• Remove the foreign matter.
If there is refrigerant leakage or clogging:
• Replace the expansion valve.
Perform discharge, charge with new refrigerant, and then go to Step 24.
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No
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Replace the condenser. (Receiver/Dryer filter is clogged.)
Then go to Step 24.
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22
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INSPECT EVAPORATIVE TEMPERATURE SENSOR
• Inspect the evaporator temperature sensor.
• Is it normal?
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Yes
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Verify the evaporator temperature sensor position.
Then go to Step 24.
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No
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Replace the evaporator temperature sensor, then go to Step 24.
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23
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INSPECT AIR MIX DOOR RELATED PART INSTALLATION
• Measure the climate control unit terminal 1G and 1I voltage when the temperature control dials are set to MAX COLD and MAX HOT by control panel.
• Are voltages are normal?
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Yes
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Go to the next step.
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No
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• Inspect the air mix link, air mix crank, and air mix rod of the A/C unit correctly and securely installed to their positions. (See A/C UNIT DISASSEMBLY/ASSEMBLY.)
• Repair or install correctly for suspect part according to inspection result, then go to next Step.
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24
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VERIFY THAT MALFUNCTION SYMPTOM DOES OCCURS AFTER REPAIR
• If the refrigerant discharged during inspection has not been recharged, discharge and charge with new refrigerant to the specified level.
• Does cool air blow out? (Are results of refrigerant system performance test normal?)
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Yes
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Troubleshooting completed. Explain repairs to customer.
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No
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Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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