Mazda CX-7 2007 Workshop Manual page 1134

NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT
5 No temperature control with climate control unit
• Malfunction in A/C unit and/or climate control unit air intake system
DESCRIPTION
• 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
POSSIBLE
• A/C unit air intake door malfunction
CAUSE
• Heater piping malfunction
Diagnostic procedure
STEP
1 INSPECT COOLANT TEMPERATURE
• Is the coolant sufficiently warmed up?
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?
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
mix links?
4 INSPECT CLIMATE CONTROL UNIT
• Inspect the climate control unit.
• Is the climate control unit normal?
5 INSPECT A/C UNIT
• Is there any foreign material or obstruction in
the A/C unit air intake doors?
6 INSPECT A/C UNIT AIR INTAKE DOOR
• Is the A/C unit air intake door securely and
properly installed?
7 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?
8 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does the unit operate in every temperature
setting?
End Of Sie
07-03–10
SYMPTOM TROUBLESHOOTING
INSPECTION
Yes Go to the next step.
No Warm up the engine, then go to Step 8.
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 8.
Yes Go to the next step.
No Adjust the air intake wire or install securely in the correct
position, then go to Step 8.
Yes Go to the next step.
No Repair or replace the climate control unit, then go to Step 8.
Yes Remove obstruction, then go to Step 8.
No Go to the next step.
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.
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.
Yes Troubleshooting completed.
Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
the malfunction recurs.
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ACTION