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.