Mazda 6 2002, Workshop Manual

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U–70
TROUBLESHOOTING
NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT
A6E858001038W07
Diagnostic procedure
End Of Sie
NO.6 WINDSHIELD FOGGED
A6E858001038W08
•
When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If
there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and
undamaged.
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 (Steps 2, 3)
•
Climate control unit rack-and-pinion, air mix wire malfunction (Step 4)
•
A/C unit air mix door malfunction (Steps 5, 6)
•
Heater piping malfunction (Step 7)
STEP INSPECTION ACTION
1 INSPECT COOLANT TEMPERATURE
•
Is coolant sufficiently warmed up?
Yes Go to 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 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 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 U–47
CLIMATE CONTROL UNIT INSPECTION )
•
Is climate control unit okay?
Yes Go to 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 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 next
step.
No Install air mix door securely in proper position, then go to
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 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.
6 Windshield fogged.
DESCRIPTION
•
A/C compressor does not operate while airflow mode is in DEFROSTER or HEAT/DEF modes.
•
Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or HEAT/DEF
modes.