STEP INSPECTION ACTION 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 compressor oil to the A/C compressor. Verify that the noise is no longer heard. Adjust refrigerant to specified amounts. 14 Verify whether malfunction is in expansion valve, air mix and compressor oil or elsewhere does refrigerant’s high-pressure value hardly increases? Yes Go to next step. (Pressure hardly increases.) No Go to step 17. 15 Verify whether a malfunction is in compressor oil amount and a/c compressor or elsewhere when engine is racing, does high-pressure value increase? Yes Return to step 3. No Go to next step 16 Verify whether malfunctions is in compressor oil amount or a/c compressor after compressor oil is replenished each 10 ml, does highpressure value increase? Yes Troubleshooting completed. (Explain to customer that cause was insufficient compressor oil.) No Replace A/C compressor. (Cause is defective AC compressor) 17 Verify whether malfunction is in expansion valve or elsewhere is only refrigerant low-pressure value high? Yes Go to step 20. No Go to next step 18 Verify that air mix is installed securely and properly are heater unit’s air mix links, air mix cranks and air mix rods securely and properly installed? Yes Go to next step No Repair or install links, cranks and rods securely in proper position. HVAC W/O ETC 22
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