All trucks have an automatic air dryer. The purpose is to filter the moisture out of the air supply in order to prevent clogging and freezing. The bright team at Volvo designed this thing to sound like an air cannon. First it makes a huge sucking sound, (which is totally appropriate since it has to suck to drive something like that) and then it blows off so loud the hair on your arms will literally stand up straight. Not only that, it goes off repeatedly, and with rhythm, so your nerves are frazzled just from the constant sucking and blowing. This is not a pleasant experience and should never be confused with anything erotic.
Since the weather is warm, the parking lot is full of Volvo trucks and Freightliners sucking and blowing.
I drive a Peterbilt, and unless it has a definite mechanical problem, I hardly ever notice my air dryer. My truck doesn't suck and it doesn't blow. It doesn't get on anyone's nerves, and it dries the air perfectly.
Freightliners are so cheaply made, and poorly designed; they constantly suck and blow, usually over and over. And many of the drivers are inexperienced and do not even realize the air dryer is broken. They think it's normal for their air pressure to drop up and down.
This means I gotta "suck it up" and try to sleep. Good night all.