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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
14.
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
Is AC hose from low-side AC
temperature control and low pressure
If frost or cool spots are
switches).
service valve to AC
forming on AC hose, AC
No moisture in AC refrigerant system.
hose is restricting R-134a
compressor free from frost
refrigerant flow.
AC low pressure switch OK.
and cool spots?
No AC condenser dryer desiccant
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contaminant in AC refrigerant system.
No AC refrigerant oil contaminant in AC
refrigerant system.
AC system charge is not low.
Recover R-134a
No AC system leaks.
refrigerant
Temperature control switch OK.
NO
(WP 0050). Replace
No air or other contaminant in AC refrigerant
restricted AC hose
system.
(WP 0040) and AC
AC condenser dryer OK.
condenser dryer
YES
AC evaporator core OK.
Evacuate and charge
AC condenser core OK.
system (WP 0050).
AC system not overcharged.
Verify repair, go to
Step 22 of this fault.
POSSIBLE PROBLEMS
Restricted AC hose.
AC compressor faulty.
AC expansion valve faulty.
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WARNING
15.
KNOWN INFO
TEST OPTIONS
Read WARNING on
Power to AC system OK.
Pressure test.
AC heater/evaporator blower OK.
AC test set manifold gage.
AC control circuits OK (except for
REASON FOR QUESTION
Does system high-side
temperature control and low pressure
switches).
pressure vary with engine
If system high pressure
No moisture in AC refrigerant system.
RPM?
varies with engine RPM,
AC low pressure switch OK.
AC expansion valve is
faulty. If not, AC
No AC condenser dryer desiccant
compressor is faulty.
contaminant in AC refrigerant system.
No AC refrigerant oil contaminant in AC
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refrigerant system.
Recover R-134a refrigerant
AC system charge is not low.
No AC system leaks.
AC condenser core OK.
compressor (WP 0023) and AC
NO
condenser dryer (WP 0025).
AC expansion valve OK.
Evacuate and charge system with
AC system not overcharged.
new R-134a refrigerant
AC condenser dryer OK.
YES
(WP 0050). Verify repair, go to
AC evaporator core OK.
Step 22 of this fault.
No restricted AC hoses.
AC compressor OK.
Recover R-134a refrigerant (WP 0050).
Temperature control switch OK.
Replace AC expansion valve (WP 0030)
POSSIBLE PROBLEMS
and AC condenser dryer (WP 0025).
Evacuate and charge system with new
Air or other contaminant in AC refrigerant
R-134a refrigerant (WP 0050). Verify
system.
repair, go to Step 22 of this fault.
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0015-22
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