Mazda CX-9 Grand Touring 2009 Manual page 1764

Is it normal?
INSPECT TO SEE WHETHER
MALFUNCTION IS IN EXPANSION
VALVE, RECEIVER/DRIER AND
REFRIGERANT LINES OR
6
ELSEWHERE
Are the refrigerant high-pressure
and low-pressure values low?
INSPECT TO SEE WHETHER
MALFUNCTION IS IN EXPANSION
VALVE AND RECEIVER/DRIER OR
ELSEWHERE
Immediately after the A/C
7
compressor operates, does the
refrigerant high-pressure value
momentarily rise to correct value,
then fall and stay below it? (Is there
negative pressure on low-pressure
side?)
INSPECT TO SEE WHETHER
MALFUNCTION IS IN EXPANSION
VALVE OR RECEIVER/DRIER
Turn the A/C switch off and let the
air conditioner stop for 10 min.
8
Start the engine.
Turn the both A/C switch and fan
switch on.
Does the malfunction occur after
the A/C compressor turns on?
VERIFY THAT EXPANSION VALVE
HEAT-SENSING TUBE WITHIN A/C
UNIT IS POSITIONED SECURELY
AND CORRECTLY
9
Is the expansion valve heat-sensing
tube in the A/C unit securely
installed in the proper position?
INSPECT REFRIGERANT LINE
Inspect the refrigerant lines.
Is the piping free of damage
and cracks?
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes
No
Yes Go to the next step.
condenser fins, then go to Step 20.
Go to Step 14.
Go to Step 10.
Replace the condenser and vacuum the refrigerant
line more than 30 min by the vacuum pump, add
refrigerant to the specified level, then go to Step 20.
(Since water has intermixed in the receiver/drier
and it is saturated, replacement is necessary.)
Replace the expansion valve, then go to Step 20.
(Since the valve closes too much, replacement is
necessary.)
Install the heat-sensing tube securely in the proper
position, then go to Step 20.