Causes are often traced back to refrigerant leaks, a clogged. Webjul 10, 2017 · your semi truck ac is still blowing, but the air isn’t cold. You know you’re going to have to stop soon for repair. But in the meantime, let’s talk about what may be. Webthere are several possible causes for why your semi truck’s ac may be blowing hot air. These include a lack of refrigerant, debris buildup inside the unit, or an electrical. This issue can also arise from a faulty.
