NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT

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NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT

B3E070301038W07

5 | No temperature control with climate control unit
DESCRIPTION | • Malfunction in A/C unit and/or climate control unit air mix system
POSSIBLE CAUSE | • A/C unit air mix link, air mix crank, air mix rod, air mix wire, wire clamp malfunction (Steps 2, 3) • Climate control unit rack-and-pinion, air mix wire malfunction (Step 4) • A/C unit air mix door malfunction (Steps 5, 6) • Heater piping malfunction (Step 7)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT COOLANT TEMPERATURE • Is the coolant sufficiently warmed up? | Yes | Go to the next step.
No | Warm up the engine, then go to Step 8.

2

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.

  - Is there grease on links and cranks?
  - Are links, cranks, and rods securely installed in their proper positions?
  - Is wire clamp free of deformation?

• Are the above items normal?

Yes

Go to the next step.

No | 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.
3 | 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? | Yes | Go to the next step.
No | Adjust the air mix wire or install securely in the correct position, then go to Step 8.
4 | INSPECT CLIMATE CONTROL UNIT • Inspect the climate control unit. • Is the climate control unit normal? | Yes | Go to the next step.
No | Repair or replace the climate control unit, then go to Step 8.
5 | INSPECT A/C UNIT • Is there any foreign material or obstruction in the A/C unit air mix doors? | Yes | Remove obstruction, then go to Step 8.
No | Go to the next step.
6 | INSPECT A/C UNIT AIR MIX DOOR • Is the A/C unit air mix door securely and properly installed? | Yes | Inspect the air mix door for cracks or damage, then go to the next step.
No | Install the air mix door securely in the proper position, then go to the next step.

7

INSPECT HEATER LINE

• Inspect the heater lines.

  - Is the heater piping free of damage and cracks?
  - Are the heater piping connections free of engine coolant leakage?
  - Are the heater piping connections securely tightened?
  - Are the heater piping installation points on A/C unit free of engine coolant leakage?

• Are the above items normal?

Yes

Operation is normal. Recheck malfunction symptoms.

No | 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.
8 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Does the unit operate in every temperature setting? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.