NO.6 AIR FROM VENTS NOT COLD ENOUGH [MANUAL AIR CONDITIONER]

id0702c2812500

6 | Air from vents not cold enough.
DESCRIPTION | • Magnetic clutch operates but A/C system malfunctions.
POSSIBLE CAUSE | Note • If the engine coolant temperature increases due to a cooling system malfunction, the fail-safe function disables the A/C operation. • Drive belt malfunction • Refrigerant pressure switch malfunction • Cooling fan system malfunction • Condenser or related part malfunction • A/C unit or condenser malfunction • Receiver/drier or expansion valve malfunction (valve closes too much) • 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

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT REFRIGERANT PRESSURE TO LOCATE MALFUNCTION • Perform refrigerant pressure check. (See REFRIGERANT PRESSURE CHECK.) • Is the refrigerant pressure normal? | Yes | Go to the next step.
No | Record the inspection result. • If the refrigerant high-pressure and low-pressure values are both high, go to Step 6. • If the refrigerant high-pressure and low-pressure values are approximately the same, go to Step 9. • If the refrigerant high-pressure and low-pressure values are both low, go to Step 11. • If there is a vacuum on the low pressure side and extremely low pressure on the high pressure side, go to Step 17. • 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 21. (See A/C COMPRESSOR REMOVAL/INSTALLATION.) • If the refrigerant pressure is other than above condition, go to Step 19.
2 | INSPECT REFRIGERANT SYSTEM PERFORMANCE • Perform refrigerant system performance test. (See REFRIGERANT SYSTEM PERFORMANCE TEST.) • Is the operation normal? | Yes | Operation is normal (Recheck malfunction symptoms.).
No | Go to the next step.
3 | INSPECT DRIVE BELT • Inspect the drive belt. (See DRIVE BELT INSPECTION [L8, LF].) • Is it normal? | Yes | Go to the next step.
No | Adjust or replace the drive belt, then the next step. (See DRIVE BELT REPLACEMENT [L8, LF].)
4 | INSPECT REFRIGERANT PRESSURE SWITCH • Inspect the refrigerant pressure switch. (See REFRIGERANT PRESSURE SWITCH INSPECTION [MANUAL AIR CONDITIONER].) • Is it normal? | Yes | Go to the next step.
No | Replace the refrigerant pressure switch, then go to Step 21. (See REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER])
5 | INSPECT REFRIGERANT PRESSURE SWITCH RELATED HARNESS • Inspect following refrigerant pressure switch wiring harness (open or short circuit) and connectors (corrosion, pulled out pins). ― PCM terminal 1J and refrigerant pressure switch terminal C ― PCM terminal 1AU and refrigerant pressure switch terminal D ― Climate control unit terminal 1K and refrigerant pressure switch terminal A ― Refrigerant pressure switch terminal B and ground • Is it normal? | Yes | Go to the next step.
No | Repair or replace malfunctioning part according to inspection result, then go to Step 21.
6 | INSPECT COOLING FAN OPERATION • Verify the cooling fan operation. (See COOLING FAN MOTOR INSPECTION [L8, LF].) • Is the cooling fan operation normal? | Yes | Go to the next step.
No | Repair or replace the malfunctioning location according to the inspection results. Then go to Step 21.
7 | VISUALLY INSPECT CONDENSER • Is the condenser fin clogged or obstructed by foreign material? | Yes | Remove the foreign material. Repair the condenser fin. Then go to Step 21.
No | Go to the next step.
8 | CHECK REFRIGERATION SYSTEM FOR OVERCHARGE OR AIR CONTAMINATION. • Is the low side line hot to the touch? | Yes | Recover refrigerant. Evacuate system for one hour. Refill with correct amount of refrigerant, and go to step 21.
No | Recover refrigerant. Evacuate for 15 minutes, refill with correct amount and go to step 21.
9 | 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 1. • 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.) | Yes | Replace the expansion valve. After performing the following servicing, go to Step 21. • Adjust the compressor oil to the specified level. • After discharging, charge with new refrigerant to the specified level.
No | Go to the next step.
10 | INSPECT AIR MIX DOOR RELATED PART INSTALLATION • Remove the A/C unit. (See A/C UNIT REMOVAL/INSTALLATION.) • Are the air mix actuator and air mix door of the A/C unit correctly and securely installed to their positions? | Yes | Adjust the compressor oil to the specified amount, then go to Step 21. (See A/C COMPRESSOR REMOVAL/INSTALLATION.)
No | Inspect the Air mix actuator and air mix door correctly and securely installed to their positions. • Repair or install correctly for suspect part according to inspection result, then go to Step 21. (See A/C UNIT DISASSEMBLY/ASSEMBLY.)
11 | INSPECT BLOWER UNIT FOR BLOCKAGE • Is the blower unit intake and air filter clogged? | Yes | Remove the cause of the clogging. Replace the air filter if it is clogged. Then go to Step 21.
No | Go to the next step.
12 | 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? | Yes | If there is leakage from a system hose connection area, go to Step 14. If there is leakage other than from a system hose connection area, go to Step 16.
No | Go to the next step.
13 | VISUALLY INSPECT REFRIGERANT LINE • Is a system hose crushed? | Yes | Replace the crushed system hose. (See REFRIGERANT LINE REMOVAL/INSTALLATION.) After performing the following servicing, go to Step 21. • Adjust the compressor oil to the specified level. • After discharging, charge with new refrigerant to the specified level.
No | Go to Step 20.
14 | CHECK TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT LINE JOINT LOOSE OR O-RING • Tighten the system hose connection area to the specified torque. (See REFRIGERANT LINE REMOVAL/INSTALLATION.) • Has the leakage stopped? | Yes | Go to the next step.
No | Go to Step 16.
15 | VISUALLY INSPECT REFRIGERANT LINE • Is a system hose crushed? | Yes | Replace the crushed system hose. (See REFRIGERANT LINE REMOVAL/INSTALLATION.) After performing the following servicing, go to Step 21. • Adjust the compressor oil to the specified level. • After discharging, charge with new refrigerant to the specified level.
No | Adjust the compressor oil to the specified amount, then go to Step 21. (See A/C COMPRESSOR REMOVAL/INSTALLATION.)
16 | VISUALLY INSPECT REFRIGERANT LINE • Is a system hose crushed? | Yes | Replace the O-ring of the leaking area. Replace the crushed system hose. (See REFRIGERANT LINE REMOVAL/INSTALLATION.) After performing the following servicing, go to Step 21. • Adjust the compressor oil to the specified level. • After discharging, charge with new refrigerant to the specified level.
No | Replace the O-ring of the leaking area. After performing the following servicing, go to Step 21. • Adjust the compressor oil to the specified level. • After discharging, charge with new refrigerant to the specified level.
17 | CHECK TO SEE WHETHER MALFUNCTION IS WATER IN REFRIGERANT SYSTEM OR ELSEWHERE • Does the refrigerant pressure on the low pressure side vary between the vacuum and normal range? | Yes | Replace the condenser. (Water in refrigerant system) (See CONDENSER REMOVAL/INSTALLATION.) Then go to Step 21.
No | Go to the next step.
18 | 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? | Yes | 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 21.
No | Replace the condenser (Receiver/Dryer filter is clogged.). (See CONDENSER REMOVAL/INSTALLATION.) Then go to Step 21.
19 | INSPECT EVAPORATIVE TEMPERATURE SENSOR • Inspect the evaporator temperature sensor. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [MANUAL AIR CONDITIONER].) • Is it normal? | Yes | Verify the evaporator temperature sensor position. (See A/C UNIT DISASSEMBLY/ASSEMBLY.) Then go to Step 21.
No | Replace the evaporator temperature sensor, then go to Step 21. (See A/C UNIT DISASSEMBLY/ASSEMBLY.)
20 | INSPECT AIR MIX DOOR RELATED PART INSTALLATION • Remove the A/C unit. (See A/C UNIT REMOVAL/INSTALLATION.) • Are the air mix actuator and air mix door of the A/C unit correctly and securely installed to their positions? | Yes | Go to the next step.
No | Inspect the Air mix actuator and air mix door correctly and securely installed to their positions. • Repair or install correctly for suspect part according to inspection result, then go to next Step. (See A/C UNIT DISASSEMBLY/ASSEMBLY.)
21 | VERIFY THAT MALFUNCTION SYMPTOM DOES NOT 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?) | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.