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System Description
The air c o n d i t i o n i n g system removes heat f r o m the passenger c o m p a r t m e n t by circulating refrigerant through the
system as s h o w n below.
BLOWER FAN
EVAPORATOR
TEMPERATURE
SENSOR
EVAPORATOR
( A b s o r p t i o n o f h e a t )
EXPANSION VALVE
( M e t e r s t h e r e q u i r e d
a m o u n t o f r e f r i g e r a n t
i n t o t h e e v a p o r a t o r )
A/C PRESSURE SWITCH
W h e n t h e r e f r i g e r a n t is b e l o w
1 9 6 k P a ( 2 . 0 k g f / c m
2
, 2 8 p s i )
o r a b o v e 3 , 1 4 0 k P a ( 3 2 k g f / c m
455 p s i ) , t h e A / C p r e s s u r e
s w i t c h o p e n s t h e c i r c u i t t o
t h e A / C s w i t c h a n d s t o p s t h e
a i r c o n d i t i o n i n g t o p r o t e c t t h e
c o m p r e s s o r .
RECEIVER/DRYER
( T r a p s d e b r i s , a n d
r e m o v e s m o i s t u r e )
CONDENSER
( R a d i a t i o n o f h e a t )
EQUALIZING TUBE
( M e t e r s p r e s s u r e a n d
i m p r o v e s t h e e x p a n s i o n
v a l v e r e a c t i o n t i m e )
CAPILLARY TUBE SENSING BULB
( C o n t r o l s t h e t e m p e r a t u r e o f t h e
r e f r i g e r a n t l e a v i n g t h e e v a p o r a t o r
b y m e t e r i n g t h e e x p a n s i o n v a l v e )
RELIEF VALVE
( R e l i e v e s p r e s s u r e a t t h e
c o m p r e s s o r w h e n t h e
p r e s s u r e is t o o h i g h )
COMPRESSOR
( S u c t i o n a n d c o m p r e s s i o n )
HIGH PRESSURE VAPOR
HIGH PRESSURE LIQUID
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR
This vehicle uses HFC-134a (R-134a) refrigerant w h i c h does not contain chlorofluorocarbons. Pay attention to the
f o l l o w i n g service items;
• Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
• Use only the r e c o m m e n d e d polyalkyleneglycol (PAG) refrigerant oil (DENSO ND-OIL8) designed for the R-134a
compressor. Intermixing the recommended (PAG) refrigerant oil w i t h any other refrigerant oil w i l l result in
compressor failure.
• All A/C system parts (compressor, discharge line, suction line, evaporator, condenser, receiver/dryer, expansion
valve, O-rings for joints) have to be proper for refrigerant R-134a. Do not confuse w i t h R-12 parts.
• Use a halogen gas leak detector designed for refrigerant R-134a.
• R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging
station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning
system.
• Always recover the refrigerant R-134a w i t h an approved recovery/recycling/charging station before disconnecting
any A/C fitting.
21-35
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Troubleshooting
