Need to add some refigerant to daughters Yukon. Where is the low side connector. There is one connector on the dryer and another on a large line. Which do I use to not blow myself up?

Not sure about the '12, but the '14 I just did the low side is down low under the a/c lines, almost impossible to get if the engine is warm, not much better even if cold. Just make sure you get on the smaller of the two fittings. Low side is always the small one.

All GM I’ve seen, low side is the large line… High side is always smaller . I will look up new and check...careful..



https://www.silveradosierra.co...lve-location.747492/