Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 1859 / 1976

I03837
Sight Glass
AC0RW-03
I01386
- AIR CONDITIONING AIR CONDITIONING SYSTEM
AC-3
1844
Author: Date:
2001 SIENNA (RM787U)
ON-VEHICLE INSPECTION
1. INSPECT REFRIGERANT VOLUME
Observe the sight glass on the liquid tube.
Test conditions:
Running engine at 1,500 rpm
Blower speed control switch set at ”HI”
A/C switch ON
Temperature control set at ”MAX. COOL”
Fully open doors
Item Symptom Amount of refrigerant Remedy
1 Bubbles present in sight glass *Insufficient
(1) Check for gas leakage with gas leak de-
tector and repair if necessary
(2) Add refrigerant until bubbles disappear
2 No bubbles present i sight glass None, sufficient or too much Refer to item 3 and 4
3
No temperature difference between com-
pressor inlet and outlet
Empty or nearly empty
(1) Check for gas leakage with gas leak de-
tector and repair if necessary
(2) Add refrigerant until bubbles disappear
4
Temperature between compressor inlet and
outlet is noticeably different
Correct or too much Refer to items 5 and 6
5
Immediately after air conditioning is turned
off, refrigerant in sight glass stays clear
Too much
(1) Discharge refrigerant
(2) Evacuate air and charge proper amount
of new refrigerant
6
When air conditioning is turned off, refriger-
ant foams and then stays clear
Correct -
*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling
is sufficient.
2. INSPECT REFRIGERANT PRESSURE WITH MAN-
IFOLD GAUGE SET
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.
Test conditions:
Temperature at the air inlet with the switch set
at RECIRC is 30 - 35
°
C (86 - 95
°
F)
Engine running at 1,500 rpm
Blower speed control set at ”HI”
Temperature control set at ”MAX COOL”
(1) Normally functioning refrigeration system
Gauge reading:
Low pressure side: 0.15 - 0.25 MPa (1.5 - 2.5 kgf/cm
2
)
High pressure side: 1.37 - 1.57 MPa (14 - 16 kgf/cm
2
)