|
STEP
|
INSPECTION
|
ACTION
|
|
1
|
CHECK A/C COMPRESSOR VANE NOISE
• Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane noise)?
|
Yes
|
Go to Step 5.
|
|
No
|
Go to next step.
|
|
2
|
INSPECT A/C COMPRESSOR SLIPPAGE NOISE
• Is there a squeaking or whirling sound (A/C compressor slippage noise)?
|
Yes
|
Go to Step 14.
|
|
No
|
Go to next step.
|
|
3
|
INSPECT A/C COMPRESSOR INTERFERENCE NOISE
• Is there a rattling or vibrating sound (interference noise)?
|
Yes
|
Go to Step 18.
|
|
No
|
Go to next step.
|
|
4
|
INSPECT MAGNETIC CLUTCH OPERATION NOISE
• Is there a clicking sound (magnetic clutch operation noise)?
|
Yes
|
Adjust clearance between pressure plate of magnetic clutch and A/C compressor pulley, then go to Step 19.
|
|
No
|
Condition is normal. (Recheck malfunction symptoms.)
|
|
5
|
INSPECT A/C COMPRESSOR NOISE TIME
• Is noise heard continuously for more than 3 seconds after A/C compressor comes on?
|
Yes
|
Go to next step.
|
|
No
|
Condition is normal. (Noise occurs for 2-3 seconds immediately after A/C compressor turns on.)
|
|
6
|
INSPECT IDLE SPEED
• Inspect idle speed.
• Is it okay?
|
Yes
|
Go to next step.
|
|
No
|
Follow the repair instruction described in section F, then go to Step 19.
|
|
7
|
INSPECT REFRIGERANT AMOUNT
• Inspect refrigerant amount.
• Is it okay?
|
Yes
|
Go to Step 10.
|
|
No
|
Go to next step.
|
|
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?
|
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.
|
|
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?
|
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.
|
|
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?
|
Yes
|
Go to next step.
|
|
No
|
Troubleshooting completed.
Explain repair to customer.
|
|
11
|
CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR ELSEWHERE
• Drain compressor oil.
• Is it contaminated with metal particles?
|
Yes
|
Go to next step.
|
|
No
|
Replace A/C compressor, then go to Step 19.
|
|
12
|
CHECK TO SEE WHETHER MALFUNCTION IS SOMEWHERE IN A/C SYSTEM OR ELSEWHERE
• Is compressor oil whitish and mixed with water?
|
Yes
|
Replace entire A/C system (excluding heater), then go to Step 19.
|
|
No
|
Go to next step.
|
|
13
|
INSPECT A/C COMPRESSOR OIL
• Is compressor oil darker than normal and contaminated with aluminum chips?
|
Yes
|
Replace A/C compressor and condenser, then go to Step 19. (Since A/C compressor may be worn and receiver/drier may be clogged, replacement of receiver/drier is necessary.)
|
|
No
|
Condition is normal. Recheck malfunction symptoms.
|
|
14
|
CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR ELSEWHERE
• Is noise heard immediately after A/C compressor is stopped?
|
Yes
|
Replace A/C compressor, then go to Step 19. (A/C compressor discharge valve left open)
|
|
No
|
Go to next step.
|
|
15
|
INSPECT DRIVE BELT
• Inspect drive belt.
• Is it okay?
|
Yes
|
Go to next step.
|
|
No
|
Adjust or replace drive belt, then go to Step 19.
|
|
16
|
INSPECT DRIVE BELT CONDITION
• Is drive belt worn?
• Does it have foreign material imbedded in it, or have oil on it?
|
Yes
|
Remove obstruction, remove oil, or replace drive belt, then go to Step 19.
|
|
No
|
Go to next step.
|
|
17
|
INSPECT MAGNETIC CLUTCH
• Inspect magnetic clutch.
• Is it okay?
|
Yes
|
Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then go to Step 19.
|
|
No
|
Replace magnetic clutch, then go to Step 19.
|
|
18
|
CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR REFRIGERANT LINES
• Is noise emitted from A/C compressor?
|
Yes
|
Visually inspect A/C compressor, replace appropriate parts if necessary, then go to next step.
|
|
No
|
If noise is due to refrigerant lines, repair detached or missing clips, tighten loose bolts, then go to next step.
|
|
19
|
VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• Has A/C compressor noise stopped?
|
Yes
|
Troubleshooting completed.
Explain repairs to customer.
|
|
No
|
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
|