Table of Contents
How do I know if my viscous fan is bad?
To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.
Should a viscous fan spin freely?
The fan should move freely by hand when the vehicle is off. Any strong resistance means its locking up. Thats when they get noisy.
Is the fan clutch connected to the water pump?
When the engine is cool or even at normal operating temperature, the fan clutch partially disengages the engine’s mechanically driven radiator cooling fan, generally located at the front of the water pump and driven by a belt and pulley connected to the engine’s crankshaft.
Should I replace fan clutch water pump?
A bad water pump bearing will usually cause the water pump to leak and/or make noise, but not always. Remove the fan clutch and see if the play is in the water pump shaft. If it feels tight (no play or wobble), replace the fan clutch.
How do you test a viscous fan?
How do you know if its working properly? When your motor is hot, you should be able to hear the fan kick in. If you can’t, pop the bonnet, and turn the vehicle off while watching the fan. If it comes to a fairly abrupt stop, the fan hub is working properly.
How do I test my viscous fan?
When your motor is hot, you should be able to hear the fan kick in. If you can’t, pop the bonnet, and turn the vehicle off while watching the fan. If it comes to a fairly abrupt stop, the fan hub is working properly. If it keeps spinning round and round, your fan hub is knackered and needs to be repaired or replaced.
What causes a fan clutch to stay engaged?
Insufficient heat in winter is another common problem but caused by the opposite fan clutch failure. If the fan clutch seizes, it remains engaged all the time, cooling off the engine too much. Excess fan noise at high speed is caused by the same problem, a seized fan clutch.
How does a water pump fan clutch work?
The fan clutch is a thermostatic device, which means it operates based off temperature, and is usually mounted on the water pump, or another belt driven pulley. The fan clutch will spin loosely until the temperature reaches a certain level, at which point the fan clutch will fully engage…
When to test a viscous fan clutch in a car?
Below, you will find information on how to test a viscous fan clutch. The air passing through the vehicle should feel cool when the AC is working as it should. However, when the clutch is not at its best, the cooling will be minimal. You can test this by switching on air conditioning at the coldest level.
How is the fan pulley connected to the water pump?
This term harkens to the day when cars and trucks used drive belts to drive the cooling fan or water pump. The engine cooling fan, made of plastic or metal, isn’t hard-connected to the fan pulley or water pump, but instead is soft-connected via the fan clutch.
How can you tell if your fan clutch is going bad?
Electronic types might freewheel, but most fan clutches should spin with a little effort. If the fan spins more than three times, you may have a bad fan clutch. If the fan doesn’t spin at all, the bearing may be seized. Wiggle the fan.