NO.4 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT [MANUAL AIR CONDITIONER]

id0702c2812400

4 | No temperature control with climate control unit.
DESCRIPTION | • Malfunction in A/C unit and/or climate control unit air intake system.
POSSIBLE CAUSE | • A/C unit air intake link, air intake crank, air intake rod malfunction • Climate control unit rack-and-pinion, air intake wire malfunction • A/C unit air intake 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 INTAKE SYSTEM • Inspect A/C unit air intake links, air intake cranks, air intake rods, air intake actuator. ― Is there grease on links and cranks? ― Are links, cranks, and rods securely installed in their proper positions? • 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 intake actuator, then go to Step 8.
3 | VERIFY THAT AIR INTAKE WIRE FROM A/C UNIT IS POSITIONED SECURELY AND CORRECTLY (IF AVAILABLE) • Is air intake wire securely installed in the correct position in relation to A/C unit air intake links? | Yes | Go to the next step.
No | Adjust air intake 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 [MANUAL AIR CONDITIONER].) • Is climate control unit okay? | Yes | Go to the next step.
No | Repair or replace climate control unit, then go to Step 8. (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)
5 | INSPECT A/C UNIT • Is there any foreign material or obstruction in A/C unit air intake doors? | Yes | Remove obstruction, then go to Step 8.
No | Go to the next step.
6 | INSPECT A/C UNIT AIR INTAKE DOORS • Is A/C unit air intake door securely and properly installed? | Yes | Inspect air intake door for cracks or damage, then go to the next step.
No | Install air intake 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.