Troubleshooting
U-32
X. Air is not cold as specified.
10
Air is not cold as specified.
Malfunction
symptom
Magnetic clutch operates, but malfunction is in a/c unit.
Possible causes
Drive belt malfunction. Step 1
l Malfunction in blower assembly, rear a/c unit and/or condenser. Steps 4, 5
l Malfunction in reservoir/drier, expansion valve (valve closes too much). Step 8
l Malfunction in refrigerant pipelines. Steps 9, 10
l Malfunction in refrigerant pipeline joints. Steps 1, 2, 12
l A/c compressor malfunction, insufficient compressor oil. Steps 14, 15
l Too much compressor oil, malfunction in expansion valve, or a/c unit air mix link
fault. Steps 16-18
Troubleshooting procedure
Step Inspection Action
1
Inspect drive belt
l Inspect drive belt
— Gy: (see b-1 adjustment of drive belt)
l Is it normal?
Yes Go to next step.
No Replace driver belt, go to step 19.
2
Inspect cooling system performance
l Test refrigerant system performance.
(refer to u-7 performance test of
refrigeration system)
l Is operation normal?
Yes Operation is normal. (recheck
malfunction symptoms)
No Go to next step.
3 Verify whether malfunction in air intake of
a/c unit and condenser or elsewhere.
l Are pressures of refrigerant pipeline at high
and low pressure side excessive high?
Yes Go to next step.
No Go to step 6.
4
Inspect a/c unit air intake port.
l Is a/c unit air intake port clogged?
Yes Remove obstruction, and then go to step
19. (if air does not reach evaporator
within cooling unit, heat exchange does
not occur and refrigerant pressure
becomes high. Therefore, removal of
obstruction is required.)
No Go to next step.
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