Midwest Reefer – Reefer Unit Sound (reefer unit hum) for American Truck Simulator
Adds the reefer unit hum to SCS refrigerated trailers in ATS 1.61: it starts when you couple and stops when you detach. CC0 Freesound recordings, no DLC needed.
Download Midwest Reefer – Reefer Unit Sound (reefer unit hum)
More screenshots on Steam Workshop ↗
What this mod does
Midwest Reefer – Reefer Unit Sound is a sound mod by Старый that brings the refrigeration unit on reefer trailers to life in American Truck Simulator. It’s part of his collection of mods for the fictional company Midwest Reefer Transport, based in Lincoln, Nebraska.
How it works
- When you couple, the trailer raises its landing gear, a short chime plays and the reefer unit’s engine starts.
- Whether you’re parked or driving, you hear a steady hum inside and outside the cab (quieter inside).
- When you detach, the unit shuts off. If you load a save with the trailer already coupled, the hum plays from the start.
- Refrigerated trailers in traffic hum too, softly and only up close.
Trailers and settings
It works with SCS’s 28, 45 and 53 ft refrigerated trailers, including doubles, both from the freight market and owned ones. You set the volume under Options › Audio › trailer noise. To make the hum play while driving, the mod replaces the trailer’s tire sound; the tractor’s tires are unchanged.
Sounds and version
The recordings come from Freesound.org under a CC0 (public domain) license, and the author made the chime himself. It’s made for 1.61 and was released on October 24, 2026. Until the first time you couple or detach, the hum may play with any trailer.
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User rating
Our rating
0.0 / 5- A new sound the base game doesn't have: the reefer unit starts and stops on its own
- Freely licensed (CC0) sounds plus the author's own chime
- Lightweight (1.5 MB) with no DLC
- Replaces the trailers' tire sound
- Until the first time you couple or detach, the hum may play with any trailer
- Only affects SCS refrigerated trailers
- A very new mod, with few subscribers so far
Requirements
- American Truck Simulator 1.61
- A Steam account
- No DLC or other mods required
How to install it
- Open the “Midwest Reefer — Reefer Unit Sound” page on Steam Workshop and click “Subscribe”.
- Launch American Truck Simulator and wait for Steam to download the mod.
- Open your profile's Mod Manager, enable the mod and confirm the changes.
- Couple an SCS refrigerated trailer (28, 45 or 53 ft, or a double).
- Adjust the volume in Options › Audio with the trailer noise slider.
Version history
-
24 Oct 2026Current
Release (1 change note)
Common problems
Which trailers does it work with?
SCS's 28, 45 and 53 ft refrigerated trailers and their doubles, from the freight market or owned.
Can I turn the volume down?
Yes, with the trailer noise slider in Options › Audio.
Does it work in Convoy?
The author says it works in single-player and Convoy, and that it's optional for other players.
Where do the sounds come from?
CC0 recordings from Freesound.org; the author made the startup chime himself.
More mods for ATS
✓ ATS 1.61 
✓ ATS 1.61 
