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NO.5 NO TEMPERATURE CONTROL WITH FRONT CLIMATE CONTROL UNIT

BME070301038207

5 | No temperature control with front climate control unit
DESCRIPTION | • Malfunction in front A/C unit's air mix system or heater piping.
POSSIBLE CAUSE | • Malfunction in front A/C unit's air mix link, crank, shaft, wire, or wire clamp • Bevel gear set (2) in front climate control unit, air mix wire, or wire clamp malfunction • Front A/C unit air mix door malfunction • Heater piping malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT COOLANT TEMPERATURE • Is coolant sufficiently warmed up? | Yes | Go to next step.
No | Warm engine up, then go to Step 8.
2 | INSPECT FRONT A/C UNIT'S AIR MIX SYSTEM • Inspect front A/C unit's air mix link, crank, shaft, and wire clamp as follows.

  - Is there grease on link and crank?
  - Are link, crank, and shaft securely installed in their proper positions?
  - Is wire clamp free of deformation?

• Are above items okay?
Yes
Go to next step.
No | Apply grease or install link, crank, and shaft securely in their proper positions. Repair or replace wire clamp. Go to Step 8.
3 | VERIFY THAT AIR MIX WIRE FROM A/C UNIT IS POSITIONED SECURELY AND CORRECTLY • Is air mix wire securely installed in the correct position in relation to front A/C unit's air mix lever? | Yes | Go to next step.
No | Adjust air mix wire or install securely in correct position, then go to Step 8.
4 | INSPECT FRONT CLIMATE CONTROL UNIT • Inspect front climate control unit as follows.

  - Is bevel gear set properly engaged?
  - Is air mix wire properly installed in correct position in relation to bevel gear?
  - Is wire clamp free of deformation?

• Are above items okay?
Yes
Go to next step.
No | Properly engage bevel gear or install air mix wire in correct position, repair or replace wire clamp, then go to Step 8.
5 | INSPECT FRONT A/C UNIT • Is there any foreign material or obstructions in front A/C unit's air mix door? | Yes | Remove obstruction, then go to Step 8.
No | Go to next step.
6 | INSPECT FRONT A/C UNIT'S AIR MIX DOOR • Inspect front A/C unit's air mix door as follows.

  - Is air mix door free of cracks and damage?
  - Is air mix door securely and properly installed?

• Are above items okay?
Yes
Go to next step.
No | Replace malfunction door or install door securely in proper position, then go to Step 8.
7 | INSPECT HEATER LINES • Inspect heater lines as follows.

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

• Are above items okay?
Yes
Operation is okay. Recheck malfunction symptoms.
No | If heater piping connections is loosened, tighten connections to specified torque. Repair or replace heater piping, then go to next step.
8 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Does unit operate in every temperature setting? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.