Mazda CX-7 2007 Workshop Manual page 1131

NO.3 AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE
Manual Air Conditioner
3 Amount of air blown from vents does not change.
• Malfunction in blower system
DESCRIPTION
• Blower relay, blower motor, resistor, airflow volume control dial malfunction
POSSIBLE
• A/C unit malfunction
CAUSE
Diagnostic procedure
STEP
1 INSPECT BLOWER SYSTEM
• Inspect the following systems and electrical
parts.
— Blower relay
— Blower motor
— Resistor
— Airflow volume control dial
— Related wiring harnesses
• Are they normal?
2 INSPECT TO SEE WHETHER MALFUNCTION
IS IN A/C UNIT OR ELSEWHERE
• Turn the ignition switch to the ON position.
• Turn the airflow volume control dial on.
• Recirculate air inside the vehicle.
• Does the blower motor rotate smoothly?
3 INSPECT A/C UNIT
• Inspect blower motor.
— Is the fan free of interference from the A/C
unit case?
— Is the fan free of foreign material and
obstructions?
• Is the fan normal?
4 INSPECT A/C UNIT INTAKE VENT
• Is the A/C unit intake vent clogged?
5 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does air blow out?
End Of Sie
NO.4 AIR INTAKE MODE DOES NOT CHANGE
4 Air intake mode does not change.
• Air intake mode does not change when switching REC/FRESH mode.
DESCRIPTION
• Air intake actuator malfunction
POSSIBLE
• Air intake door malfunction
CAUSE
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harnesses are
connected correctly and undamaged.
Diagnostic procedure
STEP
1* INSPECT AIR INTAKE ACTUATOR
(Auto A/C)
• Inspect the following items using M-MDS
simulation function.
— MIX_ACT (Air intake actuator)
• Is it okay?
(Manual A/C)
• Inspect air intake actuator.
• Is it okay?
SYMPTOM TROUBLESHOOTING
INSPECTION
INSPECTION
Yes Go to the next step.
No Repair or replace the malfunctioning part, then go to Step 5.
Yes Go to Step 4.
No Go to the next step.
Yes Go to the next step.
No Remove obstruction, repair or replace the fan and A/C unit
case, then go to Step 5.
Yes Remove obstruction, then go to the next step.
No Inspect if there are any obstructions in the A/C unit passage,
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.
Yes Go to the next step.
No Replace the air intake actuator, then go to Step 9.
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ACTION
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