Mazda 2002 6 Workshop Manual page 1228

Diagnostic procedure
STEP
1 CHECK A/C COMPRESSOR VANE NOISE
• Is there a jingling, popping, beeping, or
buzzing sound (A/C compressor vane
noise)?
2 INSPECT A/C COMPRESSOR SLIPPAGE
NOISE
• Is there a squeaking or whirling sound (A/C
compressor slippage noise)?
3 INSPECT A/C COMPRESSOR
INTERFERENCE NOISE
• Is there a rattling or vibrating sound
(interference noise)?
4 INSPECT MAGNETIC CLUTCH OPERATION
NOISE
• Is there a clicking sound (magnetic clutch
operation noise)?
5 INSPECT A/C COMPRESSOR NOISE TIME
• Is noise heard continuously for more than 3
seconds after A/C compressor comes on?
6 INSPECT IDLE SPEED
• Inspect idle speed.
(See F–8 IDLE SPEED
• Is it okay?
7 INSPECT REFRIGERANT AMOUNT
• Inspect refrigerant amount.
• Is it okay?
8 INSPECT REFRIGERANT LINES
• Inspect refrigerant lines.
— Is piping free of damage and cracks?
— Are piping connections free of oil grime?
(Visual inspection)
— Are piping connections free of gas
leakage?
— Are piping installation points on
condenser free of gas leakage?
— Are piping installation points on receiver/
drier free of gas leakage?
— Are piping installation points on A/C
compressor free of gas leakage?
— Are piping installation points on A/C unit
free of gas leakage
— Perform gas leak inspection using gas
leak tester.
• Are above items okay?
9 INSPECT EVAPORATOR PIPING
CONNECTIONS IN A/C UNIT FOR GAS
LEAKAGE
• Are piping connections for evaporator in A/C
unit free of gas leakage?
10 CHECK TO SEE WHETHER MALFUNCTION
IS IN COMPRESSOR OIL OR ELSEWHERE
• Add 20 ml {20 cc, 0.8 fl oz} of compressor
oil.
• Is noise heard when racing engine?
11 CHECK TO SEE WHETHER MALFUNCTION
IS IN A/C COMPRESSOR OR ELSEWHERE
• Drain compressor oil.
• Is it contaminated with metal particles?
12 CHECK TO SEE WHETHER MALFUNCTION
IS SOMEWHERE IN A/C SYSTEM OR
ELSEWHERE
• Is compressor oil whitish and mixed with
water?
TROUBLESHOOTING
INSPECTION
INSPECTION)
Yes Go to Step 5.
No Go to next step.
Yes Go to Step 14.
No Go to next step.
Yes Go to Step 18.
No Go to next step.
Yes Adjust clearance between pressure plate of magnetic clutch
and A/C compressor pulley, then go to Step 19.
(See U–38 MAGNETIC CLUTCH
No Condition is normal. (Recheck malfunction symptoms.)
Yes Go to next step.
No Condition is normal. (Noise occurs for 2—3 seconds
immediately after A/C compressor turns on.)
Yes Go to next step.
No Follow the repair instruction described in section F, then go
to Step 19.
Yes Go to Step 10.
No Go to next step.
Yes Go to next step.
No If piping or A/C component(s) is damaged or cracked,
replace then go to Step 19.
If there is gas leakage, repair or replace connection and
replace condenser*, then go to Step 19.
Yes Adjust refrigerant amount to specified level, then go to Step
19.
No If piping is damaged or cracked, replace then go to Step 19.
If there is gas leakage, repair or replace connection and
replace condenser*, then go to Step 19.
Yes Go to next step.
No Troubleshooting completed.
Explain repair to customer.
Yes Go to next step.
No Replace A/C compressor, then go to Step 19.
Yes Replace entire A/C system (excluding heater), then go to
Step 19.
No Go to next step.
ACTION
ADJUSTMENT)
U–77
U