Toyota Celica 2005 Repair Manual page 2428

AC−4
Condition : Periodically cools and then fails to cool
Symptom seen in
refrigeration system
During operation, pressure on low
pressure side sometimes become
a vacuum and sometime normal
2005 CELICA (RM1131U)
AIR CONDITIONING
2.
This is a method in witch the trouble is located by using a man-
ifold gauge set. Read the manifold gauge pressure when the
these conditions are established.
HINT:
It should be noted that the gauge indications may vary slightly
due to ambient temperature conditions.
I01386
Probable cause
Moisture entered in refrigeration
system freezes at expansion valve
orifice and temporarily stops cycle,
but normal state is restored after a
time when the ice melts
− AIR CONDITIONING SYSTEM
INSPECT REFRIGERANT PRESSURE WITH MAN-
IFOLD GAUGE SET
Test conditions:
Temperature at the air inlet with the switch set
S
at RECIRC is 30 − 35°C (86 − 95°F)
Engine running at 1500 rpm
S
Blower speed control switch at "HI" position
S
Temperature control dial at "COOL" position
S
(1) Normally functioning refrigeration system.
Gauge reading:
Low pressure side:
0.15 − 0.25 MPa (1.5 − 2.5 kgf/cm
High pressure side:
1.37 − 1.57 MPa (14 − 16 kgf/cm
(2) Moisture present in refrigeration system.
Diagnosis
S Drier in over−saturated state
S Moisture in refrigeration system
freezes at expansion valve orifice
and blocks circulation of refriger-
ant
2427
2
)
2)
Remedy
(1) Replace condenser
(2) Remove moisture in cycle
through repeatedly evacuating air
(3) Charge proper amount of new
refrigerant
I01387