Mazda 2002 6 - No.7 Air from Vents Cold Enough

U–72
TROUBLESHOOTING
End Of Sie
NO.7 AIR FROM VENTS COLD ENOUGH
A6E858001038W09
Diagnostic procedure
*9 INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR CONTINUITY
• Turn ignition switch to LOCK position.
• Is there continuity between following climate
control unit connector (12-pin) terminal and
air intake actuator connector terminal?
— Terminal D —Terminal 2K (FRESH
signal)
— Terminal F —Terminal 2I
(RECIRCULATE signal)
Yes Go to next step.
No Repair wiring harness between climate control unit and air
intake actuator, then go to Step 14.
*10 INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO GROUND
• Is there continuity between following climate
control unit connector (12-pin) terminal and
ground?
— Terminal 2K (FRESH signal)
— Terminal 2I (RECIRCULATE signal)
Yes Repair wiring harness between climate control unit and air
intake actuator, then go to Step 14.
No Go to next step.
*11 INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO B+
• Turn ignition switch to ON position
• Test voltage at following climate control unit
connector (12-pin) terminal.
— Terminal 2K (FRESH signal)
— Terminal 2I (RECIRCULATE signal)
• Is voltage approximately 12 V?
Yes Repair wiring harness between climate control unit and air
intake actuator, then go to Step 14.
No Replace climate control unit, then go to Step 14.
12 INSPECT BLOWER UNIT AIR INTAKE DOOR
• Is there any foreign material or obstruction in
blower unit air intake door?
Yes Remove obstruction, then go to Step 14.
No Go to next step.
13 VERIFY THAT BLOWER UNIT AIR INTAKE
DOOR IS POSITIONED SECURELY AND
PROPERLY
• Is blower unit air intake door securely and
properly positioned?
Yes Inspect air intake door for cracks or damage, then go to next
step.
No Install air intake door securely in proper position, then go to
next step.
14 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does malfunction disappear?
Yes Troubleshooting completed.
Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
STEP INSPECTION ACTION
7 Air from vents not cold enough.
DESCRIPTION • Magnetic clutch operates but A/C system malfunctions.
POSSIBLE
CAUSE
• Drive belt malfunction (Step 2)
• Malfunction in blower unit or condenser (Steps 4, 5)
• Malfunction in receiver/drier or expansion valve (valve closes too much) (Steps 8, 9)
• Malfunction in refrigerant lines (Steps 10, 11)
• A/C compressor system malfunction, insufficient compressor oil (Steps 15, 16)
• Over filling of compressor oil, malfunction in expansion valve or A/C unit air mix link system (Steps 17—
19)
STEP INSPECTION ACTION
1 INSPECT DRIVE BELT
• Inspect drive belt.
(See B–3 DRIVE BELT INSPECTION)
• Is it okay?
Yes Go to next step.
No Adjust or replace drive belt, then go to Step 20.
2 INSPECT REFRIGERANT SYSTEM
PERFORMANCE
• Perform refrigerant system performance test.
(See U–13 REFRIGERANT SYSTEM
PERFORMANCE TEST)
• Is operation normal?
Yes Operation is normal. (Recheck malfunction symptoms.)
No Go to next step.