Finding and Using Your Duramax AC Low Pressure Port

If you're sweating through your shirt while driving, finding the duramax ac low pressure port is the first thing on your to-do list to get that cab chilly again. There's nothing quite like the feeling of a Duramax engine's power, but that power doesn't mean much when the sun is beating down and your vents are blowing nothing but lukewarm air. Most of us have been there—fiddling with the dials, hoping it's just a fluke, only to realize the refrigerant is low and it's time to pop the hood. ...

March 3, 2026 · 7 min · Joslin Briks