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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
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 circuit OK (except for temperature
Is AC hose from low-side AC
control and low pressure switches).
If frost or cool spots are
service valve to AC
Low pressure switch OK.
forming on AC hose, AC
No AC condenser dryer desiccant
compressor free from frost
hose is restricting R-134a
contaminant in AC refrigerant system.
refrigerant flow.
and cool spots?
No AC refrigerant oil contaminant in AC
refrigerant system.
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AC system charge is not low.
No AC system leaks.
Temperature control switch OK.
Recover R-134a
No air or other contaminant in AC refrigerant
refrigerant
system.
NO
(WP 0053). Replace
AC condenser dryer OK.
restricted AC hose
AC evaporator core OK.
(WP 0039) and AC
No moisture in AC refrigerant system.
condenser dryer
YES
AC condenser core OK.
Evacuate and charge
AC system not overcharged.
system (WP 0053).
Verify repair, go to
POSSIBLE PROBLEMS
Step 22 of this fault.
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 circuit OK (except for temperature
REASON FOR QUESTION
Does system high-side
control and low pressure switches).
pressure vary with engine
Low pressure switch OK.
If system high pressure
No AC condenser dryer desiccant
RPM?
varies with engine RPM,
contaminant in AC refrigerant system.
AC expansion valve is
faulty. If not, AC
No AC refrigerant oil contaminant in AC
compressor is faulty.
refrigerant system.
AC system charge is not low.
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No AC system leaks.
Recover R-134a refrigerant
Temperature control switch OK.
No air or other contaminant in AC refrigerant
(WP 0053). Replace AC
system.
compressor (WP 0022) and AC
NO
condenser dryer (WP 0024).
AC condenser dryer OK.
Evacuate and charge system with
AC evaporator core OK.
new R-134a refrigerant
No moisture in AC refrigerant system.
YES
(WP 0053). Verify repair, go to
AC condenser core OK.
Step 22 of this fault.
AC system not overcharged.
No restricted AC hoses.
Recover R-134a refrigerant (WP 0053).
POSSIBLE PROBLEMS
Replace AC expansion valve (WP 0030)
and AC condenser dryer (WP 0024).
AC compressor faulty.
Evacuate and charge system with new
AC expansion valve faulty.
R-134a refrigerant (WP 0053). Verify
repair, go to Step 22 of this fault.
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0015-22
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