Suzuki Grand Vitara 1998, Service Manual

Page: 81 / 801

YH4
GRAND
VITARA
3. Bubbles
1B-10 AIR CONDITIONING (OPTIONAL)
QUICKLY CHECKING OF REFRIGERANT
CHARGE (IF EQUIPPED WITH SIGHT GLASS)
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.
CHECKING REFRIGERANT CHARGE
CONDITION POSSIBLE CAUSES CORRECTION
Bubbles observed in sight glass Insufficient charge of refrigerant in
system Check system for leaks with a leak
tester.
No bubbles observed in sight glass No charge or proper or too much
charge of refrigerant in system Refer to the following item.
No temperature difference
between compressor inlet and
outlet Empty or nearly empty system Recovery, evacuate and charge
system and then check it for leaks
with a leak tester.
Noticeable temperature difference
between compressor inlet and
outlet Proper or too much charge of
refrigerant in system Refer to the following item.
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
refrigerant to adjust it to a specified
charge.
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 refrigerant is normal.