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Heating and Air Conditioning
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A/C System Tests (cont'dl
Performance Test
Air conditioning refrigerant or lubricant vapor
can irritate vour eyes, nose, or throat.
B e c a r e f u l w h e n c o n n e c t i n g s e r v i c e e q u i p m e n t .
Do not breathe refrigerant or vapor.
The performance test will help determine if the air
conditioner system is operating within specifications.
U s e o n l y s e r v i c e e q u i p m e n t t h a t i s U . L . - l i s t e d a n d i s
certified to meet the requirements of SAE J2210 to
r e m o v e H F C 1 3 4 a ( R - 1 3 4 a ) f r o m t h e a i r c o n d i t i o n i n g
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service.
R - ' 1 3 4 a s e r v i c e e q u i p m e n t o r v e h i c l e a i r c o n d i t i o n i n g
systems should not be pressure tested or leak tested
with compressed air.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. Connect a R 134a refrigerant recovery/recycling/
charging station to the high-pressure service port
and the low-pressure service port, following the
e q u i p m e n t m a n u f a c t u r e r ' s i n s t r u c t i o n s .
2 . D e t e r m i n e t h e r e l a t i v e h u m i d i t y a n d a i r
lem peralUre.
Compressed air mixed with R-134a forms a
combustible vapor.
T h e v a p o r c a n b u r n o r e x p l o d e c a u s i n g s e r i o u s
i n j u r y .
Never use compressed aar to pressure test
R - 1 3 4 a s e r v i c e e q u i p m e n t o r v e h i c l e a i r
conditioning systems.
21-56
3 .
4 .
Remove the passenger's dashboard lower cover
(see page 20-81).
lnsert a thermometer (A) in the center vent, and
place another thermometer {B) near the blower unit.
Test conditions:
. Avoid direct sunlight, putthe top up.
. Open the hood.
. Open the front doors.
. Set the temperature control dial on Max Cool, the
mode control dial on Vent, and the recirculation
control switch on Recirculate.
. Turn the A,/C switch on and the fan switch on Max.
. R u n t h e e n g i n e a t 1 , 5 0 0 r p m .
. No driver or passengers in vehicle.
A f t e r r u n n i n g t h e a i r c o n d i t i o n i n g f o r 1 0 m i n u t e s
under the above test conditions, read the delivery
temperature from the thermometer in the center
vent, the intake temperature near the blower unit,
and the high and low system pressure from the A,/C
g a u g e s .
5 .
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Troubleshooting
