The cooling system in a big rig plays a critical role in keeping the engine operating at safe temperatures under heavy loads and long driving hours. Because diesel engines generate significant heat, even a minor cooling system issue can quickly escalate into a major problem if ignored. Understanding the most common cooling system problems helps drivers and fleet operators take swift action to avoid costly repairs, downtime, and engine damage. At Billy Bob’s Repair & Tire, we provide expert big rig cooling system repair in the greater San Antonio, TX area. Here are four common big rig cooling system problems that should be addressed ASAP. Coolant Leaks Coolant leaks are one of the most urgent cooling system issues in big rigs. Leaks can occur at hoses, radiators, or gaskets and may start small before rapidly worsening. Even a slow leak reduces coolant levels, limiting the system’s ability to regulate engine temperature. If left unchecked, coolant loss can cause overheating, warped components, and severe engine damage. Addressing leaks immediately helps maintain proper cooling and protects critical engine parts. Clogged or Failing Radiator The radiator is responsible for dissipating heat from the coolant as air passes through its fins. Over time, dirt, debris, bugs, and road grime can clog the radiator, restricting airflow and reducing cooling efficiency. Internal buildup from contaminated coolant can also block coolant passages. A clogged or failing radiator causes rising engine temperatures and should be cleaned or repaired promptly to restore proper heat transfer. Faulty Thermostat The thermostat regulates coolant flow by opening and closing based on engine temperature. When it sticks closed, coolant cannot circulate properly, leading to rapid overheating. A malfunctioning thermostat can create inconsistent temperature readings and should be replaced without delay to ensure stable engine operation. Failing Water Pump The water pump is responsible for circulating coolant throughout the engine and radiator. When it begins to fail, coolant flow is reduced or stopped entirely, causing temperatures to rise quickly. Common signs include coolant leaks near the pump and unusual noises. Because the water pump is essential to the cooling system, any signs of failure should be addressed as soon as possible. 24/7 Mobile Big Rig Repair in San Antonio, TX For roadside semi truck repair in San Antonio and the surrounding area, contact Billy Bob’s Repair & Tire at  (210) 796-3891  . Our team also provides roadside big rig repair in greater Austin, TX. Feel free to give us a call and we’ll arrive ASAP to get you back on the road!

Big rigs endure far more stress and workload than the average vehicle, which makes routine maintenance absolutely critical. Among the most important services for a commercial truck is regular oil changes. Engine oil is responsible for keeping internal components cool, clean, and properly lubricated under extreme operating conditions. When oil changes are skipped or delayed, performance can drop and the risk of expensive engine damage increases. At Billy Bob’s Repair & Tire, we provide expert semi truck maintenance in greater San Antonio, including oil changes. Here are four reasons why staying on top of oil changes is essential for your big rig. Protect the Engine From Excessive Wear A big rig’s engine works long hours, often hauling heavy loads across thousands of miles. This constant strain generates heat and friction that must be controlled. Clean oil forms a protective barrier between moving parts. When oil becomes dirty or breaks down, it can no longer offer this protection. Regular oil changes help ensure the engine stays well-lubricated, enabling it to operate smoothly and last longer. Maintain Optimal Fuel-Efficiency Dirty or degraded oil forces the engine to work harder than necessary. As oil thickens with contaminants, internal components experience more resistance, reducing overall efficiency. This increased workload can have a noticeable impact on fuel economy, which is a major concern for fleet operators and independent drivers alike. By keeping up with oil changes, you help the engine run more efficiently, leading to better mileage and lower operating costs over the long haul. Reduce the Risk of Overheating Big rigs generate tremendous heat, especially during long-distance hauls. Clean engine oil plays a vital role in regulating temperature by dispersing heat away from critical components. When oil becomes old and sludgy, it can lose much of its cooling ability. This can contribute to engine overheating, which may in turn lead to severe internal damage and costly repairs. Regular oil changes help maintain proper temperature control. Preserve Engine Cleanliness and Prevent Sludge As oil circulates, it collects debris produced by normal engine operation. If oil isn’t changed frequently enough, these contaminants build up and can create sludge. Sludge can clog oil passages and reduce lubrication—in turn causing performance issues. Routine oil changes help keep the engine clean, better enabling it to run properly. Big Rig Maintenance in San Antonio, TX For expert big rig maintenance in San Antonio, TX and the surrounding area, contact Billy Bob’s Repair & Tire at  (210) 796-3891  . Feel free to give us a call to make an appointment!