Common Signs of Semi Truck Suspension Trouble
Semi trucks are built for endurance, power, and reliability—but even the toughest rigs can overheat. When your truck’s temperature gauge starts climbing, it’s a sign that the cooling system isn’t keeping up with the engine’s heat output. Overheating can cause serious damage, leading to expensive repairs and costly downtime. Understanding the most common causes of overheating can help you stay ahead of problems. At S&K Transmission & Diesel Repair, we provide expert semi truck cooling system repair in the greater Phoenix, AZ area. Here are four common causes of semi truck overheating.
Low/Leaking Coolant
Coolant is your engine’s first line of defense against overheating. It absorbs heat from the engine and circulates it through the radiator to be cooled. If your coolant level is low due to a leak, the system can’t do its job effectively. Leaks can develop in places such as hoses, the radiator, or the water pump. Regularly checking coolant levels and inspecting for leaks can prevent heat buildup before it turns into a roadside emergency.
Faulty Thermostat
The thermostat regulates coolant flow through the engine, opening and closing to maintain the correct operating temperature. If it becomes stuck closed, coolant can’t circulate, causing the engine to overheat quickly. Replacing a faulty thermostat is a relatively inexpensive repair that can help prevent major engine damage down the line.
Clogged Radiator
The radiator plays a crucial role in cooling your semi truck’s engine, but over time, dirt, debris, and corrosion can clog passages. When this happens, the radiator can’t release enough heat, causing temperatures to climb. Regular radiator flushes and cleaning the exterior fins help ensure proper heat exchange and efficient cooling system performance.
Water Pump Failure
The water pump is responsible for circulating coolant throughout the engine. If the pump fails or becomes inefficient, coolant won’t move properly, and the engine becomes prone to overheating in short order. Water pump issues often start with minor leaks or whining noises, so addressing them early can help you avoid a full breakdown on the highway.
Semi Truck Repair in Phoenix, AZ
For expert
semi truck repair in Phoenix
and the surrounding area, contact
S&K Transmission & Diesel Repair
at
623-244-8887. Feel free to give us a call to make an appointment!












