NO.4 NO TEMPERATURE CONTROL WITH FRONT CLIMATE CONTROL UNIT

id070300801800

4 | No temperature control with front climate control unit
DESCRIPTION | • Malfunction in A/C unit and/or front climate control unit air mix system • Temperature does not change when switching front climate control unit temperature setting dial.
POSSIBLE CAUSE | • A/C unit air intake link, air intake crank, air intake rod, air intake wire, wire clamp 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 the engine at operating temperature? | Yes | Go to the next step.
No | Warm up the engine, then go to Step 9.
2 | INSPECT A/C UNIT AIR INTAKE SYSTEM • Inspect the A/C unit air intake links, air intake cranks, air intake rods, air intake 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 intake actuator or wire clamp, then go to Step 9.
3 | VERIFY THAT AIR INTAKE WIRE FROM A/C UNIT IS POSITIONED SECURELY AND CORRECTLY (IF AVAILABLE) • Is the air intake wire securely installed in the correct position in relation to the A/C unit air intake links? | Yes | Go to the next step.
No | Adjust the air intake wire or install securely in the correct position, then go to Step 9.
4 | INSPECT 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 9.
5 | INSPECT A/C UNIT • Is there any foreign material or obstruction in the A/C unit air intake doors? | Yes | Remove obstruction, then go to Step 9.
No | Go to the next step.
6 | INSPECT A/C UNIT AIR INTAKE DOOR • Is the A/C unit air intake door securely and properly installed? | Yes | Inspect the air intake door for cracks or damage, then go to the next step.
No | Install the air intake door securely in the proper position, then go to the next step.
7 | INSPECT WIRING HANESS BETWEEN CLIMATE CONTROL UNIT AND FRONT AIR MIX ACTUATOR • Disconnect the front climate control unit connector (24-pin, 16-pin). • Inspect following wiring harness and connectors for open, short or poor connection of terminals. (climate control unit—front air mix actuator) Driver-side ― 1A—G ― 1D—F ― 2F—E Passenger-side ― 1C—G ― 1E—F ― 2G—E • Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunctioning part, then go to Step 9.
No | Go to the next step.
8 | 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.
9 | VERIFY 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.