How do you know if you have a bad fan clutch?
Symptoms of a Bad Fan Clutch
- Engine overheating at low speed or when stopped is the most-common fan clutch failure symptom.
- Insufficient heat in winter is another common problem but caused by the opposite fan clutch failure.
- Excess fan noise at high speed is caused by the same problem, a seized fan clutch.
Can a fan clutch spin freely when cold?
There have been cases where fan clutches spin freely when cold, and when this happens, you have a problem in your hands. Note that there are two kinds of clutches. One operates through thermal variations, such as the one described above. The engagement and disengagement of the same will depend on how fast you drive.
What causes a car fan to spin so fast?
One acts as a holding area while the other directs to the clutch. As the valve opens, the oil enters the clutch, and this leads to the fast movement of the fan. When the valve closes, the oil moves back to the holding area, and this leads to slipping in the clutch.
What should I do if my AC Fan is not spinning?
Slide a long, thin wooden stick through the fan grate and gently push one of the blades to try to get the fan spinning. (Safety note: DO NOT use any kind of conductive metal or material to do this. Don’t put your fingers in or near the grate.) If the fan takes off and then keeps going on its own, you more than likely have a bad start capacitor.
How does the oil work in a fan clutch?
The latter fills with oil and has a valve that controls the flow of oil between two compartments. One acts as a holding area while the other directs to the clutch. As the valve opens, the oil enters the clutch, and this leads to the fast movement of the fan.
Is a radiator fan supposed to spin freely by hand?
Is the radiator fan supposed to be able to turn a bit freely by hand when the engine is off? If there is a fan clutch between the fan and radiator on your vehicle, then you will be able to turn the fan by hand when the engine is off and not running.
There have been cases where fan clutches spin freely when cold, and when this happens, you have a problem in your hands. Note that there are two kinds of clutches. One operates through thermal variations, such as the one described above. The engagement and disengagement of the same will depend on how fast you drive.
What happens if the fan blade does not move?
Grasp the fan blade and try to move it. If the fan blade will not move the fan clutch is locked up and replacement is required. The second problem a fan clutch can have is the opposite problem. The clutch fails to engage no matter how hot the engine becomes.
What happens if there is no clutch on a radiator fan?
If the fan is turning freely with no clutch, then there is a problem with either the belt being loose or the pulley will need adjustments. A fan clutch will look like part # D22175, just as an example.