Commercial truck drivers who frequently travel long distances appreciate smooth rides. However, there are times when mechanical issues cause complications and call for semi repairs. Overheating is one of the most common problems with heavy-duty vehicles. To help you decide what to do in this situation, here are a few common causes of overheating and how they’re corrected.

Why Do Semi-Trucks Overheat?

1. Coolant Issues

This liquid is responsible for cooling down the engine during operation. When coolant levels get low, overheating might happen. Though adding more product usually solves the problem, constantly low coolant could be the result of cracks in the reservoir. If you notice red puddles under the vehicle, you’re likely facing this issue. 

Your semi-truck’s belt is responsible for rotating the water pump and moving coolant throughout the system. When this component loosens or breaks, coolant will also no longer flow to the engine, causing it to overheat. If your coolant tank is filled but the engine is overheating, this might be the issue. 

2. Broken Fans

semi repairYour semi-truck has an electric fan that will start running when the temperatures in the engine reach potentially hazardous levels. If the fan does not activate, the engine may overheat.

This problem might be caused by broken fuses or damaged sensors. Repair or replacement will restore the fan’s functionality. 

3. Dirty Air Filters

When your semi-truck’s air filter becomes saturated with dirt and debris, the engine will have to work harder to provide power to the cooling system. As a result, the engine may overheat if you attempt to operate the air conditioner.

When this happens, turn off the A/C, pull over, and pop the hood. Allow the engine to cool for about 15 minutes before adding water to the radiator. Prevent overheating by replacing the air filter every 15,000 miles.


If your truck overheats, get in touch with C. L. Chase 24 Hour Towing & Recovery for semi repairs and towing. They offer emergency road services to drivers in La Crosse, Eau Claire, Jackson, Adams, Vernon, and Chippewa counties, as well as Wisconsin Rapids. Call (608) 427-6734 to request assistance, and visit the website to learn more about their work with semi repairs.