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HVAC
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1. AIR FROM VENTS NOT COLD ENOUGH
TROUBLESHOOTING HINTS
Drive belt malfunction: Step 1
Malfunction in blower unit or condenser:
Step 4, 5
Malfunction in receiver / drier, expansion valve ( valve close too much) or expansion valve heat-sensing tube
installed incorrectly: Step 8, 9
Malfunction in refrigerant lines: Step 10- 13
A/C compressor system malfunction, insufficient compressor oil:
Step 16
Too much compressor oil, expansion valve heat-sensing tube installed incorrectly, or malfunction in expan-
sion valve or heater unit’s air mix link system: 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 perfor-
mance
Perform refrigerant system perfor-
mance test (Refer AC system
performance test) is operating
normal?
Yes
Operation is normal. (Recheck malfunction symp-
toms)
No
Go to next step
3
Verify whether malfunction is in
blower unit intake and condenser
or another
Are refrigerant’s high-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 conden-
ser fins.
6
Verify whether malfunction is in
expansion valve,
receiver/drier and refrigerant lines
Yes
Go to next step