Mazda 2002 6 Workshop Manual page 1225

STEP
12 INSPECT EVAPORATOR PIPING
CONNECTIONS IN A/C UNIT FOR LOOSE
• Are piping connections for evaporator in A/C
unit loose?
13 INSPECT PIPING CONNECTIONS FOR
LOOSE
• Are piping connections loose?
14 CHECK TO SEE WHETHER MALFUNCTION
IS IN EXPANSION VALVE, AIR MIX
ACTUATOR AND COMPRESSOR OIL OR
ELSEWHERE
• Does refrigerant high-pressure value hardly
increase?
15 CHECK TO SEE WHETHER MALFUNCTION
IS IN COMPRESSOR OIL AMOUNT AND A/C
COMPRESSOR OR ELSEWHERE
• When engine is racing, does high-pressure
value increase?
16 CHECK 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?
17 CHECK TO SEE WHETHER MALFUNCTION
IS IN EXPANSION VALVE OR ELSEWHERE
• Is only refrigerant low-pressure value high?
18 VERIFY THAT AIR MIX IS INSTALLED
SECURELY AND PROPERLY
• Are A/C unit air mix links, air mix cranks, and
air mix rods securely and properly installed?
19 VERIFY THAT EXPANSION VALVE HEAT-
SENSING TUBE WITHIN A/C UNIT IS
POSITIONED SECURELY AND CORRECTLY
• Is expansion valve heat-sensing tube within
A/C unit securely installed in proper position?
20 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does cool air blow out? (Are results of
refrigerant system performance test okay?)
End Of Sie
U–74
TROUBLESHOOTING
INSPECTION
Yes Tighten connections with specified torque, adjust both
compressor oil and refrigerant to 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 Tighten connections with specified torque, adjust both
compressor oil and refrigerant to 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 next step. (Pressure hardly increases.)
No Go to Step 17.
Yes Return to Step 3.
No Go to next step.
Yes Troubleshooting completed. (Explain to customer that cause
was insufficient compressor oil.)
No Replace A/C compressor, then go to Step 20. (Cause is
defective A/C compressor.)
Yes Go to Step 19.
No Go to next step.
Yes Set fan switch to 4th position.
Turn A/C switch on.
Set FRESH mode.
Set temperature control to MAX COLD.
Set VENT mode.
(1)Start and run the engine at 1,500 rpm for 10 minutes.
(2)Run the engine at idle for 1 minute.
(3)Within 12 seconds, idle → 4,000 rpm → idle. Perform
cycle 5 times.
(4) Run the engine at idle for 30 seconds.
(5)Drain the compressor oil completely from the A/C
compressor and verify the amount.
• If there is approximately 90 ml {90 cc, 3.0 fl oz} of
compressor oil, go to Step 20.
• If there is more than 90 ml {90 cc, 3.0 fl oz} of
compressor oil, remove surplus oil and fill A/C
compressor with 90 ml {90 cc, 3.0 fl oz} of
compressor oil. Repeat Steps (1) to (5).
(Cause is excessive amount of compressor oil.)
No Repair or install links, cranks and rods securely in proper
position, then go to Step 20.
Yes Replace expansion valve, then go to next step. (Since valve
opens too much, replacement is necessary.)
No Install heat-sensing tube securely in proper position, then go
to next step.
Yes Troubleshooting completed.
Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
ACTION