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NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT

id070300800800

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 • Climate control unit rack-and-pinion, air mix wire malfunction • 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 the next step.
No | Warm engine up, then go to Step 8.
2 | INSPECT A/C UNIT AIR MIX SYSTEM • Inspect A/C unit air mix links, air mix cranks, air mix rods, air mix actuator or 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 above items okay? | Yes | Go to the next step.
No | Apply grease or install links, cranks, and rods securely in their proper positions, repair or replace 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 air mix wire securely installed in the correct position in relation to A/C unit air mix links? | Yes | Go to the next step.
No | Adjust air mix wire or install securely in correct position, then go to Step 8.
4 | INSPECT CLIMATE CONTROL UNIT • Inspect climate control unit. (See CLIMATE CONTROL UNIT INSPECTION.) • Is climate control unit okay? | Yes | Go to the next step.
No | Repair or replace climate control unit, then go to Step 8.
5 | INSPECT A/C UNIT • Is there any foreign material or obstruction in 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 DOORS • Is A/C unit air mix door securely and properly installed? | Yes | Inspect air mix door for cracks or damage, then go to the next step.
No | Install air mix door securely in proper position, then go to the next step.
7 | INSPECT HEATER LINES • Inspect heater lines. - Is heater piping free of damage and cracks? - Are heater piping connections free of engine coolant leakage? - Are heater piping connections securely tightened? - Are heater piping installation points on 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 loosed, tighten connections with specified torque. Repair or replace heater piping, then go to the 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.