The low-pressure service access gauge port valve is located on the
evaporator to accumulator/drier suction line near the dash panel at the
A/C evaporator core outlet tube.
You should have a gauge on the high side too, to get an accurate state
of charge. The high-pressure service access gauge port valve is located
on the condenser to evaporator tube to the right of the radiator. In the
stowed position it is clipped to the A/C condenser core. Remove the clip
from stowed position when servicing system.
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