Unplug the radiator fan connector. ps. The resistors reduce power to the fan, so when the coolant is not quite at operating temperature, the selected resistor will pass a reduced current to the fan, causing it to rotate at a “low-speed” setting. Since the fan consists of parts that can rotate independently, the oil in the housing has to be contained with an oil seal. If the relay fails, it will be unable to … It will work if hot wired though. Run jumper wires between the connector's two electrical terminals. In this context, “slippage” refers to the difference in the rotational speeds of the hub and the housing with the attached fan, and in some cases, the slippage can be so severe that the fan is producing only a fraction of the airflow required for the coolant to shed its heat. That reason involves the loss of oil in the housing, so let us see how that happens. LORANCE8655 MEMBER; 1990 BUICK LESABRE; 3.8L; V6; 2WD; AUTOMATIC; 185,000 MILES; Replaced relays, bought new intake temperature sensor, bought new fans, new fuses. Many older vehicles feature a mechanical clutch to engage the car radiator fan, which makes use of apulley that’s driven by a belt in order to spin. However, it often happens that the rather complicated wiring of multi-speed systems develops issues, so it could happen that the fan may only operate at its lowest speed. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. Radiator fan not working 2014 versa. It has over 180,000 miles and i've never had any problems. It must provide ground to one or other of those relays depending on need. The shear strength of the oil in the housing is a function of its viscosity, and in a new viscous coupling, the oil offers a considerable resistance if one should try to rotate the fan by hand. There are several advantages to this type of radiator fan, not the least of which is that it eliminates all the potential problems that go with a complicated electrical system. The electric fans still work in the Buick when AC is turned on, but the problem still remains on the truck fans. However, the problem with this test is the fact that there is no value against which to judge the resistance to rotation, since it almost always differs from car to car, engine to engine, and between relative housing and hub diameters. In a few cases, this circuit controls the fan directly, but more commonly, the circuit energizes a relay. Turning on the AC automatically turns on the radiator fans, hot or not hot. The effectiveness of the cooling system of any liquid-cooled engine depends on the excellent heat absorption properties of both water and air. Yes. The radiator fan on your car draws air in from the grille and over the radiator, where it cools the coolant in the radiator. If the motor fails the blades will not be able to spin or generate air flow. So how can one tell if the fan is no longer effective, especially since it is not possible to see how fast it rotates at high engine speeds? Measuring the amount of slippage on a viscous fan is near impossible, and even experienced mechanics often get it wrong. You may well ask, so in this article, we will take a closer look at what radiator fans do, how they work, and why they sometimes fail. When this happens, the relay cannot supply power to the fan, with overheating as the inevitable result. Finding the exact cause of a radiator fan motor failure is not always easy, and unless the cause is obvious, diagnosis and repair is best left to professional technicians. 3 Common Signs It’s Time for a Replacement, temperature gauge edging closer to the red than normal. Therefore, even though the fan may appear to be working, it may not be rotating fast enough to create the required airflow to carry away the heat energy in the coolant at a higher rate than at which heat is transferred to the coolant by the engine. Discussion Starter • #1 • Oct 21, 2010. If you notice that the fan motor does not work, you will need a replacement. Because the clearance between the hub and the housing is small, the oil in the housing transfers the rotation of the hub to the housing. If fan is not kicking on with A/C on signifies an issue with the A/C, not the cooling fan itself. If the clutch wears out it can lead to the fan spinning continuously, even when it’s not required, which will be quite noticeable. Kicking on with A/C on signifies an issue with the same relays my. Potential damage to your vehicle start leaking however, in some cases, the relay,! Has to be contained with an oil seal clutch to engage the car radiator fan, video energizes a can! 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