DRAFT
TB 9-2320-364-13&P-1
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued
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WARNING
6.
KNOWN INFO
TEST OPTIONS
Read WARNING on
Power to AC system OK.
Pressure test.
AC heater/evaporator blower OK.
AC test set manifold gages.
AC control circuit OK (except for temperature
Does AC test set recovery/
control and low pressure switches).
REASON FOR QUESTION
recycling manifold gage
Low pressure switch OK.
To isolate system fault.
indicate low system high-side
No AC condenser dryer desiccant
contaminant in AC refrigerant system.
pressure?
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No AC refrigerant oil contaminant in AC
refrigerant system.
AC system charge is not low.
No AC system leaks.
AC condenser core OK.
AC system not overcharged.
Go to Step 8 of this
AC condenser dryer OK.
NO
fault.
AC evaporator core OK.
AC expansion valve OK.
YES
POSSIBLE PROBLEMS
Restricted AC hoses.
AC compressor faulty.
Temperature control switch faulty.
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
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WARNING
7.
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
Are AC hoses from low-side
control and low pressure switches).
If frost or cool spots are
AC service valve to high-side
Low pressure switch OK.
forming on AC hoses,
AC service valve free from
AC hoses are restricting
No AC condenser dryer desiccant
R-134a refrigerant flow.
frost and cool spots?
contaminant in AC refrigerant system.
If not, AC compressor is
No AC refrigerant oil contaminant in AC
faulty.
refrigerant system.
AC system charge is not low.
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No AC system leaks.
Recover R-134a refrigerant
AC condenser core OK.
(WP 0053). Replace restricted
AC system not overcharged.
AC hose (WP 0039) and AC
condenser dryer (WP 0024).
AC condenser dryer OK.
NO
Evacuate and charge system
AC evaporator core OK.
(WP 0053). Verify repair, go to
AC expansion valve OK.
Step 22 of this fault.
Temperature control switch OK.
YES
No moisture in AC refrigerant system.
No air or other contaminant in AC refrigerant
Recover R-134a refrigerant (WP 0053).
system.
Flush system (WP 0053). Replace AC
POSSIBLE PROBLEMS
compressor (WP 0022) and AC
condenser dryer (WP 0024). Evacuate
Restricted AC hose.
and charge system with new R-134a
AC compressor faulty.
(WP 0053). Verify repair, go to Step 22
of this fault.
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0015-12