hi,
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
John