A continuously running engine cooling fan can be a source of irritation as well as worry for semi-truck drivers and fleet owners. This issue does affect the truck’s performance, and its operation may result in more repairs, which are costly and unnecessary due to their frequency. Knowing the causes and the solutions to the problem will save you a lot of time and money.
Let’s discuss in detail the highly probable reasons that are causing the fan of your semi-truck to run continuously and the efficient ways to solve them. The fan’s primary role is to allow air to go through the radiator, keeping the engine at the correct temperature. A continuously running fan is an indication of a need for repair. In most cases, the solenoid, the fan clutch, and the high-pressure sensor are the three main culprits behind this issue.
The Solenoid
The solenoid is a device that uses electricity to control the flow of air to the fan clutch mechanically. When the temperature of the engine exceeds a preset value, the solenoid gets activated to pump air into the clutch, which then turns the fan on. A malfunctioning solenoid could result in a situation where the fan is running nonstop. One of the most straightforward methods to test the solenoid is tracing back the air supply line to the clutch. This line is usually colored for easy identification.
The solenoid could be at fault if the outlet line has no air coming out when the truck is aired up. Replacing the solenoid is an easy and inexpensive repair. It generally consists of disconnecting the electrical plugs and taking off one bolt. This is often a quick job, and you won’t have to pay for costly mechanic bills.
The Fan Clutch
Another vital part that could trigger the fan to run all the time is the fan clutch. This assembly controls the air flow to the engine by engaging and disengaging the fan according to the engine’s temperature. The fan clutch can physically deteriorate, or the electronics can fail, and, as a result, there would be constant fan operation.
The replacement of the fan clutch is a time-consuming affair, but it is a wise move to check the solenoid and high-pressure sensor first, as their replacement could be more economical. In the case of fan clutch replacement, draining of the coolant and removing various components will be part of the process, so it will not only be more expensive but also time-consuming. It is best to go through a trial-and-error process first.
High-Pressure Sensor
The high-pressure sensor, which is generally associated with the air-conditioning system, is of paramount importance in the whole operation of the system. This sensor not only measures the pressure levels in the AC system but also sends signals to the solenoid for fan activation during the required conditions. If the sensor goes bad, the fan may get stuck in the “on” mode, which can be quite annoying and is basically a completely different problem.
To check the high-pressure sensor effectively, you should start by tracing the refrigerant lines to the AC dryer or receiver filter and locating them first. The sensor is usually positioned near, and its access is therefore easier. Replacing the high-pressure sensor could be challenging, but it’s very important for the cooling system of your truck to be working properly. The performance of the AC will not only be improved, but also the overall efficiency of your vehicle will be increased by a good sensor. If you check the sensor regularly, you will be able to catch any problems early and prevent bigger ones from happening later.
Preventive Maintenance
Preventive maintenance is the main way to battle these problems at the source. The problems will not get big if they are discovered through regular inspections and the repairs are done in time. We at Mac’s Diesel and Trailer Repair provide extensive truck repair and maintenance services. Our team of diesel expert technicians in Lexington, Kentucky, and the neighboring areas is very well equipped for handling truck repairs of different kinds, including DOT inspections and emergency roadside assistance. Do not let an endlessly running engine fan surprise you. Make an appointment with us now to have your truck in excellent condition.
When truck repair issues are concerned, the power lies in mastery. Just being aware of the usual causes of a continuously running engine fan can help you save your time, money, and nerves. It might be an improper solenoid, or a worn-out fan clutch, or a broken high-pressure sensor; in any event, doing the repair should not be procrastinated.
We at Mac’s Diesel and Trailer Repair stand out for our professionalism and dedication. The service of our mobile diesel mechanics allows them to reach your place, where they provide professional on-site truck repair and maintenance services. Our experienced team is there to keep your truck moving with trust in their skills for bus and RV repairs, and emergency roadside assistance, among other services. If you already know what you want, then you can make an appointment for one of our various heavy-duty truck services.
Better to be proactive than wait until a minor problem escalates to a major one. Give us at Mac’s Diesel and Trailer Repair in Lexington, KY, a call at (859) 433-4062 today to set your appointment and guarantee that your truck will always be kept in the best shape.