Mitsubishi 3000GT Service Manual page 1242

55-22
Low pressure High pressure
valve side
HEATERS AND MANUAL
AIR CONDITIONING
CHARGING <Vehicles using R-134a
refrigerant>
(1) With the handles turned back all the way (valve closed),
install the adaptor valve to the low-pressure side of the
gauge manifold.
(2) Connect the charging hose (blue) to the adaptor valve.
(3) Connect the quick joint (for low pressure) to the charging
hose (blue).
(4) Connect the quick joint (for low pressure) to the low pres-
sure service valve.
NOTE
The low-pressure service valve should be connected to
the low pressure hose.
Caution
1. Use tools that are designed for R-134a.
2. To install the quick joint, press section A firmly
(5) Close the high and low pressure valves of the gauge
manifold.
(6) Install the vacuum pump adaptor to the vacuum pump.
(7) z;;;gt the vacuum pump plug to the vacuum pump
(8) Connect the charging hose (yellow) to the R-l 34a connec-
tion port of the vacuum pump adaptor.
(9) Tighten the adaptor valve handle (valve open).
(ll)Turn the power switch of the vacuum pump to the ON
position.
NOTE
Even if the vacuum pump power switch is turned ON,
the vacuum pump will not operate because of the power
supply connection in step (7).
(12)Turn the vacuum pump adaptor switch to the R-134a
side to start the vacuum pump.
Caution
Do not operate the compressor during evacuation.
(13)Evacuate to a vacuum reading of 100 kPa (29.5 inHg)
or higher (takes approx. 10 minutes).
(14)Turn the vacuum pump adaptor switch OFF and allow
to stand it for 5 minutes.
Caution
Do not operate the compressor in the vacuum condi-
tion; damage may occur.
does not drop.)
Caution
If the negative pressure (vacuum) is lost, check for
loose connections. Then, repeat the evacuation proce-
dure from step (12). If negative pressure (vacuum)
is still lost, add 1 lb of refrigerant and check system
using an R-134a compatible leak detector.
TSB Revision
against the service valve until a click is heard.
When connecting, run your hand along the hose
while pressing to ensure that there are no bends
in the hose.