QUICKLY CHECKING OF REFRIGERANT
CHARGE
CHARGE OF REFRIGERANT
The following procedure can be used for quickly checking whether
the A/C system has a proper charge of refrigerant or not.
Run engine at fast idle, and operate A/C at its max. cooling capacity
for a few minutes. Then, look at the sight glass (1) on receiver/dryer
(2) and compare what is observed with the symptoms listed in
“CHECKING REFRIGERANT CHARGE” table given below.
3. Bubbles
1B-6
AIR CONDITIONING (OPTIONAL)
CHECKING REFRIGERANT CHARGE
Item
No.
Symptom
Charge of refrigerant
Correction
1
Bubbles observed in sight glass
Insufficient charge of refrigerant
in system
Check system for leaks with a
leak tester.
2
No bubbles observed in sight glass
No or insufficient charge of
refrigerant in system
Refer to the items 3 and 4.
3
No temperature difference between
compressor inlet and outlet
Empty or nearly empty system
Evacuate and charge system
and then check it for leaks with
a leak tester.
4
Noticeable temperature difference
between compressor inlet and
outlet
Proper or too much charge of
refrigerant in system
Refer to the items 5 and 6.
5
When A/C is turned OFF,
refrigerant in sight glass clears
immediately and remains clear
Too much charge of refrigerant
in system
Discharge excess charge of re-
frigerant to adjust it to a speci-
fied charge.
6
When A/C is turned OFF,
refrigerant in sight glass once
produces bubbles and then clears
Proper charge of refrigerant in
system
NO CORRECTION NEEDED
BECAUSE CHARGE OF RE-
FRIGERANT IS NORMAL.
