HVAC 29 Step Inspection Action 8 Verify whether malfunction is in expansion valve or receiver/drier. Turn A/C switch off and air conditioner stop for 10 minutes start engine turn both A/C switch and fan switch on. Does malfunction occur after compressor turn on? Yes Go to next step No Replace condenser and vacuum refrigerant line more than 30 minutes by vacuum pump, and refrigerant to specified level. (Since water has intermixed in receiver/drier and it is saturated, replacement is necessary.) 9 Verify that expansion valve heat-sensing tube within cooling unit is positioned securely and correctly is expansion valve heat-sensing tube within cooling unit securely installed in proper position? Yes Replace expansion valve. (Since valve closes too much replacement is necessary.) No Install heat-sensing tube securely in proper position. 10 Inspect refrigerant lines Is piping free of damage and cracks? Are piping connections free of oil grime? (visual inspection) Are piping installation points on a/c compressor free of gas leakage? Are piping installation on cooling unit free of gas leakage? Perform gas leak inspection using gas leak tester. Are above items okay? Yes Go to next step No If piping or an A/C component is damaged or cracked, replace it. 11 Inspect evaporator piping connections in cooling unit for gas leakage Are piping connections for evaporator in cooling unit free of gas leakage? Yes If the vane makes a noise, add 10ml of compressor oil to the A/C compressor. Verify that the noise is no longer heard. Adjust refrigerant to specified amounts. No If piping is damaged or cracked, replace it. If there is no damage, go to next step. 12 Inspect evaporator piping connections in cooling unit for looseness Yes Tighten connections to specified torque. If the vane makes a noise, add 10 ml of compressor oil to the A/C compressor. Verify that the noise is no longer heard. Adjust refrigerant to specified amounts. No If the vane makes a noise, add 10 ml of compressor oil to the A/C compressor. Verify that the noise is no longer heard. Replace O-ring on piping, adjust refrigerant to specified amounts. 13 Inspect piping connections for looseness Are piping connections loose? Yes Tighten connections to specified torque. If the vane makes a noise, add 10ml of compressor oil to the A/C compressor. Verify that the noise is no longer heard. Adjust refrigerant to specified amounts. No If the vane makes a noise, add 10ml of com-
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