Mazda CX-7 2007 Workshop Manual page 1142

STEP
5 INSPECT A/C COMPRESSOR NOISE TIME
• Is noise heard continuously for more than 3
s after A/C compressor comes on?
6 INSPECT IDLE SPEED
• Inspect idle speed.
(See 01-10-35 ENGINE TUNE-UP[L3 WITH
TC].)
• 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?
13 INSPECT A/C COMPRESSOR OIL
• Is compressor oil darker than normal and
contaminated with aluminum chips?
14 CHECK TO SEE WHETHER MALFUNCTION
IS IN A/C COMPRESSOR OR ELSEWHERE
• Is noise heard immediately after A/C
compressor is stopped?
15 INSPECT DRIVE BELT
• Inspect drive belt.
(See 01-10-3 DRIVE BELT INSPECTION[L3
WITH TC].)
• Is it okay?
07-03–18
SYMPTOM TROUBLESHOOTING
INSPECTION
Yes Go to the next step.
No Condition is normal. (Noise occurs for 2— 3 s immediately
after A/C compressor turns on.)
Yes Go to the next step.
No Follow the repair instruction described in section 01-10, then
go to Step 19.
Yes Go to Step 10.
No Go to the next step.
Yes Go to the 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 the next step.
No Troubleshooting completed.
Explain repair to customer.
Yes Go to the 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 the next step.
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.
Yes Replace A/C compressor, then go to Step 19. (A/C
compressor discharge valve left open)
No Go to the next step.
Yes Go to the next step.
No Adjust or replace drive belt, then go to Step 19.
ACTION