I01390
Condition: Insufficient cooling
I01392
Condition: Insufficient cooling
NOTE : These gauge indica-
tions are shown when the
refrigeration system has
been opened and the refrig-
erant charged without vacu-
um purging.
AC-6
-
AIR CONDITIONING
AIR CONDITIONING SYSTEM
1847
Author:
Date:
2001 SIENNA (RM787U)
(6)
Refrigerant overcharged or insufficient cooling of
condenser
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure too high on both low
and high pressure sides
No air bubbles seen through the
sight glass even when the engine
rpm is lowered
Unable to develop sufficient per-
formance due to excessive refrig-
eration system
Insufficient cooling of condenser
Excessive refrigerant in
cycle
→
refrigerant over charged
Condenser cooling
→
condenser
fins clogged of condenser fan
faulty
(1) Clean condenser
(2) Check condenser fan motor
operation
(3) If (1) and (2) are in normal
state, check amount of refrigerant
Charge proper amount of refriger-
ant
(7)
Air present in refrigeration system
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure too high on both low
and high pressure sides
The low pressure piping hot to
touch
Bubbles seen in sight glass
Air entered in refrigeration system
Air present in refrigeration sys-
tem
Insufficient vacuum purging
(1) Check compressor oil to see if
it is dirty or insufficient
(2) Evacuate air and charge new
refrigerant
