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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
20.
KNOWN INFO
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Read WARNING on
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Power to AC system OK.
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AC heater/evaporator blower OK.
TEST OPTIONS
AC control circuits OK (except for
temperature control and low pressure
Visual inspection.
Is AC expansion valve free
switches).
from excessive sweating and
REASON FOR QUESTION
No moisture in AC refrigerant system.
frost?
AC low pressure switch OK.
If AC expansion valve is free
No AC condenser dryer desiccant
from excessive sweating
contaminant in AC refrigerant system.
and frost, AC evaporator
No AC refrigerant oil contaminant in AC
core is faulty. If not, AC
refrigerant system.
expansion valve is faulty.
AC system charge is not low.
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No AC system leaks.
Recover R-134a
refrigerant (WP 0050).
Temperature control switch OK.
Replace AC expansion
No air or other contaminant in AC refrigerant
valve (WP 0030) and
system.
AC condenser dryer
AC compressor OK.
NO
(WP 0025). Evacuate
AC condenser core OK.
and charge system
AC system not overcharged.
(WP 0050). Verify
AC condenser dryer OK.
repair, go to Step 22 of
YES
this fault.
No restricted AC hoses.
POSSIBLE PROBLEMS
AC expansion valve faulty.
Recover R-134a refrigerant
AC evaporator core faulty.
(WP 0050). Replace AC
evaporator core (WP 0030)
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and AC condenser dryer
charge system (WP 0050).
Verify repair, go to Step 22 of
this fault.
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0015-28
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