![]() ![]() The CHT sensor (see the photo) works the same way, but it measures the temperature of the cylinder head metal and is not immersed in coolant. Some cars use a cylinder head temperature or CHT sensor instead of, or in addition to the ECT sensor. Steps to diagnoseĮCT sensor is connected to the engine computer or PCMĪ second coolant temperature sensor could be installed in another part of the engine, or in the radiator. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.Please note that the tool that you receive after placing an online order may be in a used but operable condition due to the nature of the Loan-A-Tool® program. Do not wear ties or loose clothing when working on your vehicle.įREE Loan-A-Tool® program requires returnable deposit. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Use caution when working with automotive batteries. ![]() Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Always chock your wheels prior to lifting a vehicle. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.īe sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. A broken, shorted, or corroded wire anywhere in the circuits involved can prevent the fan from working.Īdvice, how-to guides, and car care information featured on and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. ![]() You can check it with a multimeter, or simply swap it with a known good relay to determine if it works. Since the relay operates as a switch for the fan’s power, a defective cooling fan relay won’t energize the circuit. A signal from the coolant temperature sensor is what triggers the ECU to turn on the radiator fan, and if it’s faulty, it can prevent the fan from working at all. If it doesn’t, the motor is likely burnt out. Connect the motor directly to 12-volt power with jumper wires to see if the fan spins properly. Any visible signs like broken blades indicate that a replacement is necessary. If it burns again, there’s an excessive electrical draw or short. If the fuse is burnt, replace it with the same size and type. To determine what’s gone wrong, it helps to go through these steps for troubleshooting the radiator fan: There might also be noises like a bad bearing in the fan motor as well as other less prominent symptoms, but these are the most common. You might be able to see a broken fan blade or a motor that’s visibly burnt out when it’s looked over. It might be accompanied by a message on the cluster too. With modern cars, a DTC will be triggered that illuminates the light on the dash when it exceeds normal operating temperatures. It could be a problem with the fan motor, temperature sensor, fan control relay, or wiring. If you pop the hood, you won’t see the radiator fans moving any faster than a lazy spin. The fan isn’t spinning when the engine is warm.It’s especially noticeable with temperature spikes in traffic. It might drop again as you start moving faster. Since the car’s momentum isn’t pushing enough air through the radiator at low speeds, the temperature will begin to creep up and overheat. You might see one or more of these symptoms: It has a direct impact on the engine’s operating temperature and any systems that are related to it. If the cooling fan isn’t working right, it is certainly going to make itself evident quickly. ![]()
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