DIAGNOSTIC PROCEDURE
NO.8 AIR FROM FRONT/REAR VENTS NOT COLD ENOUGH DIAGNOSTIC PROCEDURE
CAUSE
z
Malfunction in refrigerant lines
z
A/C compressor system malfunction, insufficient compressor oil
z
Over filling of compressor oil, malfunction in expansion valve or A/C unit air
mix link system
STEP
INSPECTION
ACTION
1
INSPECT DRIVE BELT
z
Inspect the drive belt.
(See
DRIVE BELT
INSPECTION [MZI-3.7]
.)
z
Is it normal?
Yes Go to the next step.
No
Adjust or replace the drive belt, then go to Step 20.
(See
DRIVE BELT
REMOVAL/INSTALLATION [MZI-3.7]
.)
2
INSPECT REFRIGERANT SYSTEM
PERFORMANCE
z
Perform refrigerant system
performance test. (See
REFRIGERANT SYSTEM
PERFORMANCE TEST
.)
z
Is the operation normal?
Yes
Operation is normal. (Recheck malfunction
symptoms.)
No
Go to the next step.
3
INSPECT TO SEE WHETHER
MALFUNCTION IS IN A/C UNIT
INTAKE AND CONDENSER OR
ELSEWHERE
z
Are the refrigerant high-pressure
and low-pressure values both high?
Yes Go to the next step.
No
Go to Step 6.
4
INSPECT A/C UNIT INTAKE
z
Is the A/C unit intake clogged?
Yes
Remove obstruction, then go to Step 20. (If air does
not reach the evaporator in the A/C unit, heat
exchange does not occur and refrigerant pressure
becomes high. Therefore, removal of obstruction is
necessary.)
No
Go to the next step.
5
INSPECT CONDENSER
z
Inspect the condenser.
(See
CONDENSER
INSPECTION
.)
Yes
Adjust refrigerant to the specified amount, then go
to Step 20. (Excessive amount of refrigerant.)
No
Replace the condenser, or repair and clean the
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 22
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