Mazda CX-7 2007 Workshop Manual page 1138

STEP
9 VERIFY THAT EXPANSION VALVE HEAT-
SENSING TUBE WITHIN A/C UNIT IS
POSITIONED SECURELY AND CORRECTLY
• Is the expansion valve heat-sensing tube in
the A/C unit securely installed in the proper
position?
10 INSPECT REFRIGERANT LINE
• Inspect the refrigerant lines.
— Is the piping free of damage and cracks?
— Are the piping connections free of oil
grime? (Visual inspection)
— Are the piping connections free of gas
leakage?
— Are the piping installation points on the
condenser free of gas leakage?
— Are the piping installation points on the
receiver/drier free of gas leakage?
— Are the piping installation points on the A/
C compressor free of gas leakage?
— Are the piping installation points on the A/
C unit free of gas leakage?
— Perform gas leakage inspection using a
gas leak tester.
• Are the above items normal?
11 INSPECT EVAPORATOR PIPING
CONNECTION IN A/C UNIT FOR GAS
LEAKAGE
• Are piping the connections for the evaporator
in the A/C unit free of gas leakage?
12 INSPECT EVAPORATOR PIPING
CONNECTION IN A/C UNIT FOR LOOSE
• Are the piping connections for the evaporator
in the A/C unit loose?
13 INSPECT PIPING CONNECTION FOR LOOSE
• Are the piping connections loose?
14 INSPECT TO SEE WHETHER MALFUNCTION
IS IN EXPANSION VALVE, AIR MIX
ACTUATOR AND COMPRESSOR OIL OR
ELSEWHERE
• Does the refrigerant high-pressure value
hardly increase?
15 INSPECT TO SEE WHETHER MALFUNCTION
IS IN COMPRESSOR OIL AMOUNT AND A/C
COMPRESSOR OR ELSEWHERE
• When the engine is racing, does the high-
pressure value increase?
16 INSPECT TO SEE WHETHER MALFUNCTION
IS IN COMPRESSOR OIL AMOUNT OR A/C
COMPRESSOR
• After compressor oil is replenished each 10
ml {10 cc, 0.34 fl oz}, does high-pressure
value increase?
07-03–14
SYMPTOM TROUBLESHOOTING
INSPECTION
Yes Replace the expansion valve, then go to Step 20. (Since the
valve closes too much, replacement is necessary.)
No Install the heat-sensing tube securely in the proper position,
then go to Step 20.
Yes Go to the next step.
No If the piping or A/C component (s) are damaged or cracked,
replace them.
Then go to Step 20.
If there is no damage, go to Step 13.
Yes If the vane makes a noise, add 10 ml {10 cc, 0.34 fl oz} of
compressor oil to the A/C compressor. Verify that the noise
is no longer heard.
Adjust refrigerant to the specified amount, then go to Step
20.
No If the piping is damaged or cracked, replace it.
Then go to Step 20.
If there is no damage, go to the next step.
Yes Tighten the connections to the specified torque, adjust both
compressor oil and refrigerant to the specified amount, then
go to Step 20.
No If the vane makes a noise, add 10 ml {10 cc, 0.34 fl oz} of
compressor oil to the A/C compressor. Verify that the noise
is no longer heard.
Replace the O-ring on piping, adjust refrigerant to the
specified amount, then go to Step 20.
Yes Tighten the connections to the specified torque, adjust both
compressor oil and refrigerant to the specified amount, then
go to Step 20.
No If the vane makes a noise, add 10 ml {10 cc, 0.34 fl oz} of
compressor oil to the A/C compressor. Verify that the noise
is no longer heard.
Replace O-ring on piping, adjust refrigerant to specified
amount, then go to Step 20.
Yes Go to the next step. (Pressure hardly increases.)
No Go to Step 17.
Yes Return to Step 3.
No Go to the next step.
Yes Troubleshooting completed. (Explain to customer that cause
was insufficient compressor oil.)
No Replace the A/C compressor, then go to Step 20. (Cause is
defective A/C compressor.)
ACTION