STEP
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INSPECTION
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ACTION
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1
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INSPECT COOLANT TEMPERATURE
• Is the coolant sufficiently warmed up?
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Yes
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Go to the next step.
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No
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Warm up the engine, then go to Step 8.
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2
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INSPECT A/C UNIT AIR MIX SYSTEM
• Inspect the A/C unit air mix links, air mix cranks, air mix rods, air mix actuator, and wire clamp.
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- Is there grease on links and cranks?
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- Are links, cranks, and rods securely installed in their proper positions?
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- Is wire clamp free of deformation?
• Are the above items normal?
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Yes
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Go to the next step.
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No
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Apply grease or install the links, cranks, and rods securely in their proper positions, repair or replace the air mix actuator or wire clamp, then go to Step 8.
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3
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VERIFY THAT AIR MIX WIRE FROM A/C UNIT IS POSITIONED SECURELY AND CORRECTLY (IF AVAILABLE)
• Is the air mix wire securely installed in the correct position in relation to the A/C unit air mix links?
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Yes
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Go to the next step.
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No
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Adjust the air mix wire or install securely in the correct position, then go to Step 8.
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4
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INSPECT CLIMATE CONTROL UNIT
• Inspect the climate control unit.
• Is the climate control unit 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 climate control unit, then go to Step 8.
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5
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INSPECT A/C UNIT
• Is there any foreign material or obstruction in the A/C unit air mix doors?
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Yes
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Remove obstruction, then go to Step 8.
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No
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Go to the next step.
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6
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INSPECT A/C UNIT AIR MIX DOOR
• Is the A/C unit air mix door securely and properly installed?
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Yes
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Inspect the air mix door for cracks or damage, then go to the next step.
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No
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Install the air mix door securely in the proper position, then go to the next step.
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7
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INSPECT HEATER LINE
• Inspect the heater lines.
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- Is the heater piping free of damage and cracks?
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- Are the heater piping connections free of engine coolant leakage?
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- Are the heater piping connections securely tightened?
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- Are the heater piping installation points on A/C unit free of engine coolant leakage?
• Are the above items 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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If heater piping connections are loose, tighten the connections to the specified torque.
Repair or replace the heater piping, then go to the next step.
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8
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR
• Does the unit operate in every temperature setting?
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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 the malfunction recurs.
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