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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
8.
KNOWN INFO
TEST OPTIONS
Read WARNING on
Power to AC system OK.
Visual inspection.
AC heater/evaporator blower OK.
REASON FOR QUESTION
AC control circuits OK (except for
Does AC condenser fan motor
temperature control and low pressure
If AC condenser fan motor
on/off cycle vary as the
switches).
on/off cycle does not vary
AC low pressure switch OK.
as the temperature control
temperature control switch is
switch is adjusted,
No AC condenser dryer desiccant
adjusted from coldest
temperature control switch
contaminant in AC refrigerant system.
position to off position?
is faulty.
No AC refrigerant oil contaminant in AC
refrigerant system.
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AC system charge is not low.
No AC system leaks.
Replace temperature
AC condenser core OK.
control switch
AC expansion valve OK.
NO
(WP 0044). Verify
AC system not overcharged.
repair, go to Step 22
AC condenser dryer OK.
of this fault.
AC evaporator core OK.
YES
No restricted AC hoses.
AC compressor OK.
POSSIBLE PROBLEMS
Temperature control switch faulty.
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
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WARNING
9.
KNOWN INFO
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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
Does AC system provide
switches).
If AC system does not cool
adequate cooling?
AC low pressure switch OK.
adequately, air or other
No AC condenser dryer desiccant
contaminant may have
contaminant in AC refrigerant system.
entered system.
No AC refrigerant oil contaminant in AC
refrigerant system.
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AC system charge is not low.
No AC system leaks.
Perform leak test
AC condenser core OK.
(WP 0049). Recover
AC expansion valve OK.
NO
R-134a refrigerant
AC system not overcharged.
(WP 0050). Replace
AC condenser dryer OK.
AC dryer (WP 0025).
Evacuate and charge
AC evaporator core OK.
YES
system with new
No restricted AC hoses.
R-134a refrigerant
AC compressor OK.
(WP 0050). Verify
Temperature control switch OK.
repair, go to Step 22 of
this fault.
POSSIBLE PROBLEMS
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
Go to Step 22 of this fault.
system.
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0015-14
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