If memory serves me the low pressure connector is located in the center of
the engine compartment, tucked in and under the cowl panel. Looking at the
engine compartment, you may have to move some components out of the way
without disconnecting anything. If you can't find it locate the accumulator
approx. 8" long tubular) and follow the line to the low pressure connector.
The low pressure connector is almost always connected not far from the
accumulator. Sometimes a low pressure connector will be on the accumulator.
It may also be connected at the manifold line connection to the compressor.
It all depends on whether the air was dealer or factory installed. The low
pressure connector will be the bigger of the two connectors. Hope this
helps, good luck