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Page Title:
AC DOES NOT COOL OR COOLS INADEQUATELY - continued |
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 DRAFT
TB 9-2320-364-13&P-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 circuit OK (except for temperature
Does AC condenser fan motor
control and low pressure switches).
If AC condenser fan motor
on/off cycle vary as the
Low pressure switch OK.
on/off cycle does not vary
as the temperature control
temperature control switch is
No AC condenser dryer desiccant
switch is adjusted,
contaminant in AC refrigerant system.
adjusted from coldest
temperature control switch
No AC refrigerant oil contaminant in AC
position to off position?
is faulty.
refrigerant system.
AC system charge is not low.
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No AC system leaks.
AC condenser core OK.
Replace temperature
AC system not overcharged.
control switch
AC condenser dryer OK.
NO
(WP 0044). Verify
AC evaporator core OK.
repair, go to Step 22
AC expansion valve OK.
of this fault.
No restricted AC hoses.
YES
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 circuit OK (except for temperature
REASON FOR QUESTION
control and low pressure switches).
Does AC system provide
Low pressure switch OK.
If AC system does not cool
adequate cooling?
No AC condenser dryer desiccant
adequately, air or other
contaminant in AC refrigerant system.
contaminant may have
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.
AC condenser core OK.
Perform leak test
AC system not overcharged.
(WP 0052). Recover
AC condenser dryer OK.
NO
R-134a refrigerant
AC evaporator core OK.
(WP 0053). Replace
AC dryer (WP 0024).
AC expansion valve OK.
Evacuate and charge
No restricted AC hoses.
YES
system with new
AC compressor OK.
R-134a refrigerant
Temperature control switch OK.
(WP 0053). Verify
repair, go to Step 22 of
POSSIBLE PROBLEMS
this fault.
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
Go to Step 22 of this fault.
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0015-14
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