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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
13.
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
Are AC evaporator core and
temperature control and low pressure
If AC evaporator core and
system low-side AC hose at
switches).
system low-side AC hose
AC evaporator core free from
AC low pressure switch OK.
at AC evaporator core are
excessive sweating and
free from excessive
No AC condenser dryer desiccant
sweating and frost, AC
contaminant in AC refrigerant system.
frost?
system may be
No AC refrigerant oil contaminant in AC
overcharged. If not, AC
refrigerant system.
expansion valve is faulty
AC system charge is not low.
or moisture may have
Recover R-134a
No AC system leaks.
entered system.
refrigerant (WP 0050).
Temperature control switch OK.
Replace AC
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No air or other contaminant in AC refrigerant
expansion valve
system.
(WP 0030) and AC
NO
AC condenser dryer OK.
condenser dryer
AC evaporator core OK.
(WP 0025). Evacuate
and charge system
No restricted AC hoses.
(WP 0050). Verify
YES
AC compressor OK.
repair, go to Step 22
AC condenser core OK.
of this fault.
POSSIBLE PROBLEMS
Moisture in AC refrigerant system.
AC expansion valve faulty.
Recover R-134a refrigerant
(WP 0050). Replace AC
AC system overcharged.
condenser dryer (WP 0025).
Evacuate and charge system
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(WP 0050). Verify repair, go
to Step 22 of this fault.
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0015-20
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