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AC-3
AIR CONDITIONING - AIR CONDITIONING SYSTEM
AC22F-07
Sight Glass ON-VEHICLE INSPECTION
1. INSPECT REFRIGERANT VOLUME
Observe the sight glass on the liquid tube.
Test conditions:
S Running engine at 1,500 rpm
S Blower speed control switch at "HI" position
S A/C switch ON
S Temperature control dial at "COOL" position
N18077
S Fully open the doors
Item Symptom Amount of refrigerant Remedy
(1) Check for gas leakage with gas leak de-
1 Bubbles present in sight glass Insufficient* tector and repair if necessary
(2) Add refrigerant until bubbles disappear
2 No bubbles present in sight glass None, sufficient or too much Refer item 3 and 4
(1) Check for gas leakage with gas leak de-
No temperature difference between com-
3 Empty or nearly empty tector and repair if necessary
pressor inlet and outlet
(2) Add refrigerant until bubbles disappear
Temperature between compressor inlet and
4 Correct or too much Refer to items 5 and 6
outlet is noticeably different
(1) Discharge refrigerant
Immediately after air conditioning is turned
5 Too much (2) Evacuate air and charge proper amount
off, refrigerant in sight glass stays clear
or purified refrigerant
When air conditioning is turned off, refriger-
6 Correct -
ant foams and then stays clear
*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling
is sufficient.
2002 4RUNNER (RM887U)
Author : Date : 1772
AC-4
AIR CONDITIONING - AIR CONDITIONING SYSTEM
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:
S Temperature at the air inlet with the switch set
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