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HVAC
35
HVAC
1. AIR FROM VENTS NOT COLD ENOUGH
TROUBLESHOOTING HINTS
x
Drive belt malfunction: Step 1
x
Malfunction in blower unit or condenser:
Step 4, 5
x
Malfunction in receiver / drier, expansion valve ( valve close too much) or expansion valve heat-sensing tube
installed incorrectly: Step 8, 9
x
Malfunction in refrigerant lines: Step 10- 13
x
A/C compressor system malfunction, insufficient compressor oil:
Step 16
x
Too much compressor oil, expansion valve heat-sensing tube installed incorrectly, or malfunction in expan-
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stem: Step 18- 19
TROUBLE SHOOTING
Step
Inspection
Action
1
Inspect drive belt
See whether the belt is present or
fitted with correct tension.
Yes
Go to next step
No
Adjust or replace drive belt.
2
Inspect refrigerant system per-
formance
Perform refrigerant system per-
formance test (
Refer AC system
performance test)
Is operating
normal?
Yes
Operation is normal. (Recheck malfunction
symptoms.)
NO
Go to next step
3
Verify whether malfunction is in
blower unit intake and condenser
or another Ar
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-
pressure and low pressure values
both high?
Yes
Go to next step.
No
Go to step 6.
4
Inspect blower unit intake Is
blower unit intake clogged
Yes
Remove obstruction.
(If air does not reach evaporator within cooling
unit, heat exchange does not occur, refrigerant
pressure becomes high, and therefore, removal
of obstruction is necessary.)
No
Go to next step
5
Inspect condenser
is it okay?
Yes
Adjust refrigerant to specified amount.
(Excessive amount of refrigerant.)
No
Replace condenser, or repair and clean con-
denser fins.
6
Verify whether malfunction is in
expansion valve,
receiver/drier and refrigerant lines
or elsewhere
Are
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-pressure
and low-
pressure values low?
Yes
Go to next step
No
Go to step 14