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Page Title:
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued |
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 DRAFT
TB 9-2320-279-13-1
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued
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WARNING
18.
KNOWN INFO
Read WARNING on
Power to AC system OK.
AC heater/evaporator blower OK.
AC control circuits OK (except for
Is AC condenser dryer free
temperature control and low pressure
TEST OPTIONS
from frost, sweating, and cool
switches).
Visual inspection.
No moisture in AC refrigerant system.
spots?
AC low pressure switch OK.
REASON FOR QUESTION
No AC condenser dryer desiccant
contaminant in AC refrigerant system.
If AC condenser dryer is free
Recover R-134a
from frost and cool spots,
No AC refrigerant oil contaminant in AC
refrigerant (WP 0050).
AC expansion valve is
refrigerant system.
Replace AC condenser
faulty. If not, AC
AC system charge is not low.
dryer (WP 0025).
condenser dryer is faulty.
NO
No AC system leaks.
Evacuate and charge
system (WP 0050).
Temperature control switch OK.
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Verify repair, go to
No air or other contaminant in AC refrigerant
Step 22 of this fault.
system.
YES
AC compressor OK.
AC condenser core OK.
AC system not overcharged.
Recover R-134a refrigerant
AC evaporator core OK.
(WP 0050). Replace AC
expansion valve (WP 0030)
No restricted AC hoses.
and AC condenser dryer
POSSIBLE PROBLEMS
charge (WP 0050). Verify
AC expansion valve faulty.
repair, go to Step 22 of this
AC condenser dryer faulty.
fault.
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WARNING
19.
KNOWN INFO
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Read WARNING on
TEST OPTIONS
Power to AC system OK.
AC heater/evaporator blower OK.
Visual inspection.
AC control circuits OK (except for
REASON FOR QUESTION
temperature control and low pressure
Is AC hose from AC
switches).
If frost or cool spots are
evaporator core to AC
No moisture in AC refrigerant system.
forming on AC hose, AC
compressor free from frost
AC low pressure switch OK.
hose is restricting R-134a
refrigerant flow.
No AC condenser dryer desiccant
and cool spots?
contaminant in AC refrigerant system.
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No AC refrigerant oil contaminant in AC
refrigerant system.
AC system charge is not low.
Recover R-134a
No AC system leaks.
refrigerant (WP 0050).
Temperature control switch OK.
Replace restricted AC
No air or other contaminant in AC refrigerant
hose (WP 0040) and
system.
AC condenser dryer
NO
AC compressor OK.
(WP 0025). Evacuate
and charge system
AC condenser core OK.
(WP 0050). Verify
AC system not overcharged.
YES
repair, go to Step 22 of
AC evaporator core OK.
this fault.
POSSIBLE PROBLEMS
Restricted AC hose.
AC expansion valve faulty.
AC condenser dryer faulty.
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0015-26
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