Cooling fan system running non-stop. Since power to the cooling fan is sometimes routed through the cooling fan resistor, when it fails or has any problems, it can cause issues with the regular operation of the fans, which can lead to overheating. On some modern vehicles, the fan may come on at higher speeds as well to supplement the airflow. If You Think The Problem Is The Cooling Fan Relay, Test It ! Engine fan: Most vehicles today have a thermostatically controlled electric fan that comes on when additional engine cooling is necessary. 2. The easiest way to find out is to read the trouble code memory and check the … If the motor fails the blades will not be able to spin or generate air flow. All aspects of the cooling system, from the fan to the thermostat to the radiator hoses, must be in good operating condition to ensure that the engine does not overheat, which can lead to a costly repair bill. Cooling fans do not function. 1. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. Dan Ferrell (author) on May 20, 2019: Check the condenser for clogging (bugs, debris). If they run, your problem lies elsewhere. A faulty radiator fan can cause many problems. Cooling fan system not working completely. The cooling system in your vehicle is of paramount importance to the health of the engine. Next thing to check is for power at the fan connectors. If it stops working, your engine could overheat and be damaged. Signs of a failing radiator fan. The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. Electric Fan(s) not working, Checking the fan(s), relay, fuse and engine temperature sensor's. If either does not run, it's the motor. If the relay fails, it … 2. Common symptoms of a bad engine coolant sensor are overheating, difficult starting conditions, poor idle, check engine light ON and electric fans not working properly. Verify that the fans work by unplugging them and run jumper wires to the fan(s) from the battery. Usually a bad cooling fan resistor will produce a few symptoms that can alert the driver of a potential problem that should be serviced. Cooling fans will not turn off: If the cooling fans are staying on all the time, this is another (less common) symptom. Replacement may be necessary if it’s not working right. 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