Checking Of Refrigerant Volume; Installation Of Manifold Gauge Set - Toyota Hilux Surf 1993 Owner's Manual

AC–16
Item
Symptom
Bubbles present in sight glass
No bubbles present in sight glass
No temperature difference be–
tween compressor inlet and out–
let
Temperature between compres–
sor inlet and outlet is noticeably
different
Immediately after air condition–
ing is turned off, refrigerant in
sight glass stays clear
When air conditioning is turned
off, refrigerant foams and then
stay clear
*: Bubbles in the sight glass with ambient temperatures higher can be considered normal if cooling is sufficient
AIR CONDITIONING SYSTEM
REFRIGERATION SYSTEM

Checking of Refrigerant Volume

1. RUN ENGINE AT APPROX. 1,500 RPM
2. OPERATE AIR CONDITIONING AT MAXIMUM COOLING
FOR A FEW MINUTES
3. CHECK AMOUNT OF REFRIGERANT
Observe the sight glass on the receiver.
Amount of refrigerant
Insufficient *
None, sufficient or too much
Empty or nearly empty
Proper or too much
Too much
Proper

Installation of Manifold Gauge Set

HINT: To prevent releasing refrigerant, use charging
hoses with a stop valve when installing the manifold
gauge set to service valves on the refrigerant line.
Part No. of charging hoses with a stop valve
1. CONNECT CHARGING HOSES WITH A STOP VALVE TO
MANIFOLD GAUGE SET
Tighten the nuts by hand.
CAUTION:
• Do not connect the wrong hoses to the high pressure
and the low pressure sides.
• To prevent loosening the nuts, do not apply compres–
sor oil to seat of the connection.
2. CLOSE HAND VALVES OF BOTH STOP VALVES
3. CLOSE BOTH HAND VALVES OF GAUGE SET
4. REMOVE CAPS FROM SERVICE VALVES ON REFRIGER–
ANT LINE
– Refrigeration System
(1) Check for gas leakage with
(2) Add refrigerant until bubbles
Refer to items 3 and 4
(1) Check for gas leakage with
(2) Add refrigerant until bubbles
Refer to items 5 and 6
(1) Recover refrigerant
(2) Evacuate air and charge
Remedy
gas leak tester and repair if
necessary
disappear
gas leak tester and repair if
necessary
disappear
proper amount of purified
refrigerant