Where is the low side a.c. port on a 1994 Buick skylark with 3.1 engine?

The low-side AC port on a 1994 Buick Skylark with a 3.1L engine is typically located on the compressor, itself. It's usually the smaller of the two ports on the compressor. However, it's *not* always easily visible and might be partially obscured by hoses or other components.

To be absolutely certain, you'll likely need to:

* Consult a repair manual specific to your 1994 Buick Skylark 3.1L: These manuals will have diagrams showing the exact location of all AC components, including the low and high side ports.

* Look closely at the compressor: The ports are usually threaded and will have a fitting for the AC hoses. Look for the smaller diameter port. The low side usually has a service port valve cap.

* Trace the refrigerant lines: The low-pressure line will be thinner than the high-pressure line and will connect to the low-side port.

Important Safety Note: Working with automotive AC systems involves refrigerant that can cause serious injury or death if mishandled. If you're not experienced working with AC systems, it's strongly recommended you take your vehicle to a qualified automotive technician for service.