This issue can also arise from a faulty. 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.

You know you’re going to have to stop soon for repair. Webjul 10, 2017 · your semi truck ac is still blowing, but the air isn’t cold. But in the meantime, let’s talk about what may be.